Every living creature commences its existence under a form different from, and simpler than, that which it eventually attains.

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

I am too much of a sceptic to deny the possibility of anything especially as I am now so much occupied with theology but I don't see my way to your conclusion.

Agnosticism, in fact, is not a creed, but a method, the essence of which lies in the rigorous application of a single principle. ... Positively the principle may be expressed: In matters of the intellect, follow your reason as far as it will take you, without regard to any other consideration. And negatively: In matters of the intellect, do not pretend that conclusions are certain which are not demonstrated or demonstrable.

For every man the world is as fresh as it was at the first day, and as full of untold novelties for him who has the eyes to see them.

The rung of a ladder was never meant to rest upon, but only to hold a man's foot long enough to enable him to put the other somewhat higher.

Natural knowledge, seeking to satisfy natural wants, has found the ideas which can alone still spiritual cravings. I say that natural knowledge, in desiring to ascertain the laws of comfort, has been driven to discover those of conduct, and to lay the foundations of a new morality.