It is always advisable to perceive clearly our ignorance.
Ignorance more frequently begets confidence than does knowledge: it is those who know little… who so positively assert that this or that problem will never be solved by science.
A scientific man ought to have no wishes, no affections, – a mere heart of stone.
Man in his arrogance thinks himself a great work, worthy of the interposition of a deity. More humble, and I believe truer, to consider him created from animals.
Wherever the European had trod, death seemed to pursue the aboriginal.
The very essence of instinct is that it’s followed independently of reason.
In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.
Besides love and sympathy, animals exhibit other qualities connected with the social instincts which in us would be called moral.
Animals may be constantly seen to pause, deliberate and resolve.