Sayings of the Holy Fathers:

"Never form a close friendship with someone who enjoys noisy and drunken feasts, or who likes telling dirty stories... Do not let his filth defile you; do not fall under the influence of people who are unclean and uncircumcised in heart."

St. John of Karpathos

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"To remember God is not the same thing as to love God. To fear Him is not the same as to keep His commandments. They are quite different things, though they become one in those who are prefect and impassible."

St. Symeon the New Theologian