Setting an example is not the main means of influencing others, it is the only means.

The original: "Example is not the main thing. It is the only thing. That is, if the one giving the example is not saying to himself, 'Behold I am giving an example." That spoils it. Anyone thinking of the example he will give to others has lost his simplicity. Only as a man has simplicity can his example influence others" is a quote by Albert Schweitzer, from a 1952 interview in United Nations World magazine. Not attributed to Einstein until the 1990s.