[...] any fool can make a discovery. Every baby has to discover more in the first years of its life than Roger Bacon ever discovered in his laboratory.
The reasonable man adapts himself to the world; the unreasonable one persists to adapt the world to himself. Therefore all progress depends on the unreasonable man.
Taking all the round of professions and occupations, you will find that every man is the worse for being poor; and the doctor is a specially dangerous man when poor.
New opinions often appear first as jokes and fancies, then as blasphemies and treason, then as questions open to discussion, and finally as established truths.
A man's behaviour may be quite harmless and even beneficial, when he ismorally behaving like a scoundrel. And he may do great harm when he is morally acting on the highest principles.