Knowledge without courage is sterile. Author: Baltasar Gracián Copy Quote More from Baltasar Gracián “The great art of giving consists in this the gift should cost very little and y…” “Never do anything when you are in a temper, for you will do everything wrong.” “Things do not pass for what they are, but for what they seem. Most things are j…” “Be open to suggestion, no one is so perfect that they may not need advice from …”