Both Self-restraint and Unrestraint are a matter of extremes as compared with the character of the mass of mankind; the restrained man shows more and the unrestrained man less steadfastness than most men are capable of.
I always check my harness before I do a stunt; I test-drive the cars I have to race or explode; I'm present at all pyrotechnical rehearsals; and I walk through everything step-by-step. No man should put their life in someone else's hands unless they have covered their own safety from all angles.
Man's respect for the imponderables varies according to his mental constitution and environment. Through certain modes of thought and training it can be elevated tremendously, yet there is always a limit.