"â€¦There are times when something is asked of us, and we find we must do it. There is no calculation involved, no measure of the necessity of the thing itself, the action that must be performed. There is simply an acknowledgment that we will do the thing in question, and then the thing is done, often at considerable personal cost. " "What goes into these decisions? What tiny factors, invisible, in the jutting edges of personality and circumstance, contribute to this inevitability?"