Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common.Denis Diderot
Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.Epictetus
Imagine for yourself a character, a model personality, whose example you determine to follow, in private as well as in public.Epictetus