Our friends show us what we can do; our enemies teach us what we must do.
Gray are all the theories, But green is the tree of life.
Whatever is the object of a saint's hope is the subject of his prayer.
Deny yourself! You must deny yourself! That is the song that never ends.
The senses do not deceive us, but the judgment does.
The real scholar learns how to evolve the unknown from the known, and draws near the master.