True science and true religion are twin sisters, and the separation of either from the other is sure to prove the death of both. Science prospers exactly in proportion as it is religious; and religion flourishes in exact proportion to the scientific depth and firmness of its basis.

A drop of water is as powerful as a thunder-bolt.

Freedom and order are not incompatible... truth is strength... free discussion is the very life of truth.

I have endeavoured to show that no absolute structural line of demarcation, wider than that between the animals which immediately succeed us in the scale, can be drawn between the animal world and ourselves; and I may add the expression of my belief that the attempt to draw a physical distinction is equally futile, and that even the highest faculties of feeling and of intellect begin to germinate in lower forms of life.

There are savages without God in any proper sense of the word, but none without ghosts.

It is far better for a man to go wrong in freedom than to go right in chains.

The dogma of the infallibility of the Bible is no more self-evident than is that of the infallibility of the popes.