Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage.

Courage is grace under pressure.

We must build dikes of courage to hold back the flood of fear.

Courage is resistance to fear, mastery of fear, not absence of fear.

He who is not courageous enough to take risks will accomplish nothing in life.