Sayings of the Holy Fathers:

"Life is hope free from all anxiety, wealth hidden from the senses but attested by the understanding and by the true nature of things."

St. Peter of Damaskos

(Twenty-Four Discourses no. 6, The Philokalia Vol. 3 pg 224)

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Sinful thoughts continually disturb a man. But if he does not cooperate with them, then he is not guilty of them.

St. Ambrose of Optina (+1891)

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This deceiver and corrupter of souls has often driven many out of their mind. No other thought is so difficult to tell in confession as this. That is why it often remains with many to the very end of their lives. For nothing gives the demons and bad thoughts such power over us as nourishing and hiding them in our heart unconfessed.

St. John Climacus

"The Ladder of Divine Ascent," (Boston: Holy Transfiguration Monastery, 1978),STEP 23: On Mad Pride, and, in the Same Step, on Unclean Blasphemous Thoughts