Most persons have but a very moderate capacity of happiness. Expecting...in marriage a far greater degree of happiness than they commonly find, and k… - John Stuart Mill

On the average, a person who cares for other people, for his country, or for mankind, is a happier man than one who does not; but of what use is it to preach this doctrine to a man who cares for nothing but his own ease, or his own pocket? He cannot care for other people if he would. It is like preaching to the worm who crawls on the ground, how much better it would be for him if he were an eagle.

The beliefs which we have the most warrant for have no safeguard, but a standing invitation to the whole world to prove them unfounded.

First, if any opinion is compelled to silence, that opinion may, for aught we can certainly know, be true. To deny this is to assume our own infallibility. Secondly, though the silenced opinion be an error, it may, and very commonly does, contain a portion of truth; and since the general or prevailing opinion on any subject is rarely or never the whole truth, it is only by the collision of adverse opinions, that the remainder of the truth has any chance of being supplied. Thirdly, even if the received opinion be not only true, but the whole truth; unless it is suffered to be, and actually is, vigorously and earnestly contested, it will, by most of those who receive it, be held in the manner of a prejudice, with little comprehension or feeling of its rational grounds. And not only this, but, fourthly, the meaning of the doctrine itself will be in danger of being lost, or enfeebled, and deprived of its vital effect on the character and conduct: the dogma becoming a mere formal profession, inefficacious for good, but cumbering the ground, and preventing the growth of any real and heartfelt conviction, from reason or personal experience.