Medical science has made such tremendous progress that there is hardly a healthy human left.

We can't allow science to undo its own good work.

The really important facts were that spatial relationships had ceased to matter very much and that my mind was perceiving the world in terms of other than spatial categories. At ordinary times the eye concerns itself with such problems as where? — how far? — how situated in relation to what? In the mescaline experience the implied questions to which the eye responds are of another order. Place and distance cease to be of much interest. The mind does its perceiving in terms of intensity of existence, profundity of significance, relationships within a pattern.

Every gain made by individuals or society is almost instantly taken for granted.

It is a bit embarrassing to have been concerned with the human problem all one's life and find at the end that one has no more to offer by way of advice than 'try to be a little kinder.'

It is delightful to read on the spot the impressions and opinions of tourists who visited a hundred years ago, in the vehicles and with the aesthetic prejudices of the period, the places which you are visiting now. The voyage ceases to be a mere tour through space; you travel through time and thought as well.

To his dog, every man is Napoleon; hence the constant popularity of dogs.