All of our holy fathers knew this and all with one accord teach that perfection in holiness can be achieved only through humility.
John CassianNo just man suffices unto himself for the winning of justification. The divine mercy must always hold out a hand to his footsteps as they falter and almost stumble, and this is so because the weakness of his free will may cause him to lose balance, and if he falls he may perish forever.
John Cassian...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 CassianIf the kingdom of God is within us and that is a kingdom of justice, of peace, and of joy then whoever remains with these virtues is certainly in the kingdom of God. By contrast, all who deal in unrighteousness, in discord, and in death-bearing gloom have taken their stand in the kingdom of the devil, in hell and in lifelessness. It is by these tokens that the kingdom of God or of the devil is recognized.
John Cassian