The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind.

Friendship involves many things but, above all the power of going outside oneself and appreciating what is noble and loving in another.

Men can intoxicate themselves with ideas as effectually as with alcohol or with bang and produce, be dint of serious thinking, mental conditions hardly distinguishable from monomania.

Life is too short to occupy oneself with the slaying of the slain more than once.

I hated tobacco. I could have almost lent my support to any institution that had for its object the putting of tobacco smokers to death...I now feel that smoking in moderation is a comfortable and laudable practice, and is productive of good. There is no more harm in a pipe than in a cup of tea. You may poison yourself by drinking too much green tea, and kill yourself by eating too many beefsteaks. For my part, I consider that tobacco, in moderation, is a sweetener and equalizer of the temper.

Extinguished theologians lie about the cradle of every science, as strangled snakes beside that of Hercules

The Bible has been the Magna Charta of the poor and of the oppressed.