Thomas H. Huxley

It is not who is right, but what is right, that is of importance.

The great end of life is not knowledge but action.

I have no faith, very little hope, and as much charity as I can afford.

Perhaps the most valuable result of all education is the ability to make yourself do the thing you have to do, when it ought to be done, whether you like it or not.

Irrationally held truths may be more harmful than reasoned errors.

Agnosticism simply means that a man shall not say he knows or believes that for which he has no grounds for professing to believe.

Every great advance in natural knowledge has involved the absolute rejection of authority.

Science comits suicide when it adopts a creed.

The deepest sin against the human mind is to believe things without evidence.

It is an error to imagine that evolution signifies a constant tendency to increased perfection. That process undoubtedly involves a constant remodelling of the organism in adaptation to new conditions; but it depends on the nature of those conditions whether the directions of the modifications effected shall be upward or downward.