We are half ruined by conformity; but we should be wholly ruined without it. – Charles Dudley Warner

The fatal tendency of mankind to leave off thinking about a thing when it is no longer doubtful, is the cause of half their errors. – John Stuart Mill

There are some men who turn a deaf ear to reason and good advice, and willfully go wrong for fear of being controlled. РJean de La Bruy̬re, Characters, 1688

The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. – G.B. Shaw, Man and Superman, 1903