I resolved from the beginning of my quest that I would not be misled by sentiment and desire into beliefs for which there was no good evidence. - Bertrand Russell

"I don't want to! Why should I?" "Because more people will be happier if you do than if you don't." "So what? I don't care about other people." "You should." "But why?" "Because more people will be happier if you do than if you don't."

The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holder's lack of rational conviction. Opinions in politics and religion are almost always held passionately.

These illustrations suggest four general maxims[...].
The first is: remember that your motives are not always as altruistic as they seem to yourself.
The second is: don't over-estimate your own merits.
The third is: don't expect others to take as much interest in you as you do yourself.
And the fourth is: don't imagine that most people give enough thought to you to have any special desire to persecute you.