The willing horse is always overworked.

It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change, that lives within the means available and works co-operatively against common threats.

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

Hence, a traveller should be a botanist, for in all views plants form the chief embellishment.

On your life, underestimating the proclivities of finches is likely to lead to great internal hemorrhaging.

Everything in nature is the result of fixed laws.

There is no fundamental difference between man and the higher mammals in their mental faculties...The difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind.