When you fail to carry out the divine precepts of faith, your faith is blind. For if the precepts of God are light, it is clear that when you fail to put the divine precepts into practice you are without divine light. You are God's servant merely in name, not in reality.
Go to the tombs and see that the assurance of men is nothing. Why then does man who is dust indulge in vainglory? Why does he who is all stench exalt himself? Let us therefore weep for ourselves while we have time, lest, at the hour of our departure, we be found asking God for extra time to repent.
Do not befoul your intellect by clinging to thoughts filled with anger and sensual desire. Otherwise you will lose your capacity for pure prayer and fall victim to the demon of listlessness.
If we cut off the causes of the passions for only a short while, and occupy ourselves with spiritual contemplation without making it our sole and constant concern, we easily revert to the passions of the flesh, gaining nothing from our labor but theoretical knowledge coupled with conceit. The result is a gradual darkening of this knowledge itself and a complete turning of the intellect towards material things.
Almost every sin is committed for the sake of sensual pleasure; and sensual pleasure is overcome by hardship and distress arising either voluntarily from repentance, or else involuntarily as a result of some salutary and providential reversal.
He who like Job and the courageous martyrs bears the assaults of unsought-for trials and temptations with an unshakeable will is a powerful lamp; for by his bravery and patience he keeps the light of salvation burning, since he possesses the Lord as his strength and his song. (cf. Ps. 118: 14).
Do not measure yourself by the standard of weaker men, but strive rather to apply yourself to the commandment of love. In measuring yourself by the former you fall into the pit of presumption, in striving for the latter you advance to the heights of humility.
Do not disregard your conscience, which always counsels you of the best. It puts before you divine and angelic advice; it frees you from the hidden stains of your heart, and will make you the gift of free speech with God at the time of your departure.