Second, his sola fide heresy.
That the Good Thief showed remorse and was forgiven and in Heaven the same day does not negate the faith and works required. Neither does the example of the Good Thief negate the existence of Purgatory.
The Good Thief not only showed remorse, but while in his own agony showed kindness towards Jesus Christ, God. Quite evidently, that act earned unique merit. Who among us today has the opportunity to give succor to Our Redeemer in His very moment of agony? One other person, the Bad Thief, had the same opportunity, but choose to abuse Our Redeemer. God may have judged the Good Thief sufficiently "clean" (no defiled thing enters Heaven) to enter Heaven immediately OR God may have judged the Good Thief needed the rest of the day in Purgatory (after all, we have reports that an hour in Purgatory seems as 30 years). We do not know which way God judged (Purgatory or not) except that same day the Good Thief deserved to be in Heaven for his act of kindness and succor.
Hence, the example of the Good Thief reinforces (1) the special circuмstance of the Good Thief's act and (2) the normative way to Heaven indeed requires good acts and faith:
“But wilt thou know, O vain man, that faith without works is dead? Was not Abraham our father justified by works, offering up Isaac his son upon the altar?” James 2:20-21
“Not every one that saith to me, Lord, Lord, shall enter into the kingdom of heaven: but he that doth the will of my Father who is in heaven, he shall enter into the kingdom of heaven.” Matthew 7:21
“…But if thou wilt enter into life, keep the commandments.” Matthew 19:17
“And when he was gone forth into the way, a certain man running up and kneeling before him, asked him, Good Master, what shall I do that I may receive life everlasting? And Jesus said to him, Why callest thou me good? None is good but one, that is God. Thou knowest the commandments: Do not commit adultery, do not kill, do not steal, bear not false witness, do no fraud, honour thy father and mother. But he answering, said to him: Master, all these things I have observed from my youth. And Jesus looking on him, loved him, and said to him: One thing is wanting unto thee: go, sell whatsoever thou hast, and give to the poor, and thou shalt have treasure in heaven; and come, follow me.” Mark 10:17-21
“And a certain ruler asked him, saying: Good master, what shall I do to possess everlasting life? And Jesus said to him: Why dost thou call me good? None is good but God alone. Thou knowest the commandments: Thou shalt not kill: Thou shalt not commit adultery: Thou shalt not steal: Thou shalt not bear false witness: Honour thy father and mother. Who said: All these things have I kept from my youth. Which when Jesus had heard, he said to him: Yet one thing is wanting to thee: sell all whatever thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, follow me.” Luke 18:18-22
“Amen, amen I say to you: If any man keep my word, he shall not see death for ever.” John 8:51
“You are my friends, if you do the things that I command you.” John 15:14
“Wonder not at this; for the hour cometh, wherein all that are in the graves shall hear the voice of the Son of God. And they that have done good things, shall come forth unto the resurrection of life; but they that have done evil, unto the resurrection of judgment” John 5:28-29
“For in Christ Jesus neither circuмcision availeth any thing, nor uncircuмcision: but faith that worketh by charity.” Galatians 5:6
“…and if I should have all faith, so that I could remove mountains, and have not charity, I am nothing.” 1 Corinthians 13:2
“Wherefore, my dearly beloved, (as you have always obeyed, not as in my presence only, but much more now in my absence,) with fear and trembling work out your salvation” Phillipians 2:12
“But he that shall persevere to the end, he shall be saved.” Matthew 24:13
“What shall it profit, my brethren, if a man say he hath faith, but hath not works? Shall faith be able to save him? And if a brother or sister be naked, and want daily food: And one of you say to them: Go in peace, be ye warmed and filled; yet give them not those things that are necessary for the body, what shall it profit? So faith also, if it have not works, is dead in itself. But some man will say: Thou hast faith, and I have works: shew me thy faith without works; and I will shew thee, by works, my faith.” James 2:14-18
“…Who will render to every man according to his works.” Romans 2:6
“For not the hearers of the law are just before God, but the doers of the law shall be justified.” Romans 2:13
“Know you not, that to whom you yield yourselves servants to obey, his servants you are whom you obey, whether it be of sin unto death, or of obedience unto justice.” Romans 6:16
“Therefore, brethren, we are debtors, not to the flesh, to live according to the flesh. For if you live according to the flesh, you shall die: but if by the Spirit you mortify the deeds of the flesh, you shall live.… For the Spirit himself giveth testimony to our spirit, that we are the sons of God. And if sons, heirs also; heirs indeed of God, and joint heirs with Christ: yet so, if we suffer with him, that we may be also glorified with him.” Romans 8:12-17
“For if God hath not spared the natural branches, fear lest perhaps he also spare not thee. See then the goodness and the severity of God: towards them indeed that are fallen, the severity; but towards thee, the goodness of God, if thou abide in goodness, otherwise thou also shalt be cut off.” Romans 11:21-22
“And being consummated, he became, to all that obey him, the cause of eternal salvation.” Hebrews 5:9
“Follow peace with all men, and holiness: without which no man shall see God.” Hebrews 12:14
“Take heed to thyself and to doctrine: be earnest in them. For in doing this thou shalt both save thyself and them that hear thee.” 1 Timothy 4:16
“For the Son of man shall come in the glory of his Father with his angels: and then will He render to every man according to his works.” Matthew 16:27
“For we must all be manifested before the judgment seat of Christ, that every one may receive the proper things of the body, according as he hath done, whether it be good or evil.” 2 Corinthians 5:10
“And I saw the dead, great and small, standing in the presence of the throne, and the books were opened; and another book was opened, which is the book of life; and the dead were judged by those things which were written in the books, according to their works.” Apocalypse 20:12
“There shall not enter into it [Heaven] any thing defiled, or that worketh abomination or maketh a lie, but they that are written in the book of life of the Lamb.” Apocalypse 21:27
The unrighteous are condemned for failing to do good deeds. Matthew 25:31-46
“But be ye doers of the word, and not hearers only, deceiving your own selves. For if a man be a hearer of the word, and not a doer, he shall be compared to a man beholding his own countenance in a glass. For he beheld himself, and went his way, and presently forgot what manner of man he was. But he that hath looked into the perfect law of liberty, and hath continued therein, not becoming a forgetful hearer, but a doer of the work; this man shall be blessed in his deed. And if any man think himself to be religious, not bridling his tongue, but deceiving his own heart, this man’ s religion is vain. Religion clean and undefiled before God and the Father, is this: to visit the fatherless and widows in their tribulation: and to keep one’s self unspotted from this world.” James 1-22-27
“Now the works of the flesh are manifest, which are fornication, uncleanness, immodesty, luxury, Idolatry, witchcrafts, enmities, contentions, emulations, wraths, quarrels, dissensions, sects, Envies, murders, drunkenness, revelings, and such like. Of the which I foretell you, as I have foretold to you, that they who do such things shall not obtain the kingdom of God.” Galatians 5:19-21
“Little children, let no man deceive you. He that doth justice is just, even as he is just.” 1 John 3:7