And here it ought to be pointed out why so few reach this high state of perfect union with God. It should be known that the reason is not that God wishes only a few of these spirits to be so elevated; He would rather want all to be perfect, but He finds few vessels that will endure so lofty and sublime a work. . . . There are many who desire to advance and persistently beseech God to bring them to this state of perfection. Yet when God wills to conduct them through the initial trials and mortifications, as is necessary, they are unwilling to suffer them and they shun them, flee from the narrow road of life [Mt. 7:14] and seek the broad road of their own consolation, which is that of their own perdition [Mt. 7:13]; thus they do not allow God to begin to grant their petition. They are like useless containers, for although they desire to reach the state of the perfect they do not want to be guided by the path of trials that leads to it.”
—Saint John of the Cross
The Living Flame of Love, Stanza 2.27