Philanthropy should be voluntary.

- Bill Gates

Every man is surrounded by a neighborhood of voluntary spies.

- Jane Austen

Belief, like love, must be voluntary.

- John Updike

I would say if we can select children who are not going to be severely disadvantaged, then we should do so, but I think it has to be done by voluntary choice.

- John Sulston

Morality is only moral when it is voluntary.

- Lincoln Steffens

Drunkenness is nothing but voluntary madness.

- Seneca