“I am in favour of courage—who is ever not in the abstract?—but not of treating it as a substitute for wisdom, as I fear we are currently in danger of doing.”

“In the moment when we answer “what do I intend to do about that?”, we are really saying, “This is how I currently define myself. This is how I define Who I Really Am. This is how I define Divinity, as a matter of fact.””

“We must substitute courage for caution.”

“When I hear music, I fear no danger. I am invulnerable. I see no foe. I am related to the earliest times, and to the latest.”

“Courage is strength in the face of knowledge of what is to be feared or hoped. Wisdom is prudent strength.”

“Fear is illusory; it cannot live. Courage is eternal, it will not die. Perils, calamities, dangers are the certain lot of every man who is a denizen of this world. Therefore, O Man! Fortify your mind with courage and patience. Fortitude, courage, presence of mind will sustain you through all dangers.”

“Courage is defined as: the ability to face danger, difficulty, uncertainty, or pain without being overcome by fear or being deflected from a chosen course of action. Many of today’s world leaders have great courage: I wonder… would we be better off with cowardice?”

“The career of a young theoretical physicist consists of treating the harmonic oscillator in ever-increasing levels of abstraction.”

“When the bow and the sling were laid aside in favour of the gun, prudence naturally forbade the putting an instrument of so dangerous a nature into the hands of children; they however provided themselves a substitute for the gun…”

“Courage is when we can overcome the fear and apprehension that pervades our hearts and minds when we find no other way out except by facing danger.”