Mars, therefore, is not only uninhabited by intelligent beings such as Mr. Lowell postulates, but is absolutely uninhabitable.

Modification of form is admitted to be a matter of time

What birds can have their bills more peculiarly formed than the ibis, the spoonbill, and the heron?

In all works on Natural History, we constantly find details of the marvellous adaptation of animals to their food, their habits, and the localities in which they are found.

Civilisation has ever accompanied emigration and conquest - the conflict of opinion, of religion, or of race

Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.

I hold with Henry George, that at the back of every great social evil will be found a great political wrong

I am thankful I can see much to admire in all religions.

In my solitude I have pondered much on the incomprehensible subjects of space, eternity, life and death.

The white men in our colonies are too frequently the savages

To say that mind is a product or function of protoplasm, or of its molecular changes, is to use words to which we can attach no clear conception

Peace is everyone’s birthright.

A cup of wisdom is more valuable than an ocean of intelligence.

Drink coffee! Do stupid things faster and with more energy!

Accept the past as past, without denying it or discarding it.

Some are born who never need them, Others still who never read them, signs.

I get energy from one-on-one conversations most often, and I lose energy from group conversations most often.

I know of no manner of speaking so offensive as that of giving praise, and closing it with an exception.

In art as in politics we must deal with people as they are not as we wish them to be. Only by working with the real can you get closer to the ideal.

Who said time machines haven't been built yet? They already exist. They're called books