...works of piety and charity... are necessary in this present life for as long as inequality prevails. Their workings here would not be required were it not for the superabundant numbers of the poor, the needy, and the sick... As long as this inequity rages in the world, these good works will be necessary and valuable to anyone practicing them and they shall yield the reward of an everlasting inheritance to the man of good heart and concerned will.
John CassianMore John Cassian quotes
The apostles were very sure that everything of theirs which had to do with salvation was a gift to them from God. 'Increase our faith'. They did not presume that the fullness of faith would come to them merely because they freely opted for it. They believed, rather, that it was a gift of God which would have to be granted to them.
John Cassian
... a Christian is quite certain to fall into the same sins which he condemns in another with merciless and inhuman severity, for 'a stern king will fall into misfortunes,' and 'one who stops his ears so as not to hear the weak, shall himself cry, and there shall be none to hear him' (Prov. 13:17; 21:13).
John Cassian