I can remember the very spot in the road, whilst in my carriage, when to my joy the solution occurred to me.

Light will be thrown on the origin of man and his history.

Man himself cannot express love and humility by external signs, so plainly as does a dog, when with drooping ears, hanging lips, flexuous body, and wagging tail, he meets his beloved master.

Language is an art, like brewing or baking.... It certainly is not a true instinct, for every language has to be learnt.

If worms have the power of acquiring some notion, however rude, of the shape of an object and over their burrows, as seems the case, they deserve to be called intelligent; for they act in nearly the same manner as would man under similar circumstances.

Sympathy will have been increased through natural selection

The question of whether there exists a Creator and Ruler of the Universe has been answered in the affirmative by some of the highest intellects that have ever existed.