Of course, one should get to confession after having committed a mortal sin, but do the prayers of soul in mortal sin have any effect? In other words, would the prayers of a soul in mortal sin count before God? Would they count only if the soul in mortal sin will go to confession in the near future?

The Second Degree Of Prayer: The Prayer Of Sinners

Another degree of prayer is that of those who are weighed down by the guilt of mortal sin, but who strive, with what is called dead faith, to raise themselves from their condition and to ascend to God. But, in consequence of their languid state and the extreme weakness of their faith, they cannot raise themselves from the earth. Recognising their crimes and stung with remorse of conscience, they bow themselves down with humility, and, far as they are removed from God, implore of Him with penitential sorrow, the pardon of their sins and the peace of reconciliation.

The prayers of such persons are not rejected by God, but are heard by Him[/n]. Nay, in His mercy, He generously invites such as these to have recourse to Him, saying: Come to me, all you that labour, and are heavily laden, and I will refresh you, of this class was the publican, who, though he did not dare to raise his eyes towards heaven, left the Temple, as (our Lord) declares, more justified than the Pharisee.

The Lowest Degree Of Prayer: The Prayer Of The Impenitent

The last degree is that of those who not only do not repent of their sins and enormities, but, adding crime to crime, dare frequently to ask pardon of God for those sins, in which they are resolved to continue. With such dispositions they would not presume to ask pardon from their fellow­man.

The prayer of such sinners is not heard by God. It is recorded of Antiochus: Then this wicked man prayed to the Lord, of whom he was not to obtain mercy. Whoever lives in this deplorable condition should be vehemently exhorted to wean himself from all affection to sin, and to return to God in good earnest and from the heart.