“Those who are enslaved to their sects are not merely devoid of all sound knowledge, but they will not even stop to learn!”

Look to the nervous system as the key to maximum health.

Laziness breeds humors of the blood.

After coitus every animal is sad, except the human female and the rooster.

What I mean by photographing as a participant rather than observer is that I’m not only involved directly with some of the activities that I photograph, such as mountain climbing, but even when I’m not I have the philosophy that my mind and body are part of the natural world

The reason that I keep writing is that all my most powerful messages about the fates of wild places that I care about need to have words as well as images

The best physician is also a philosopher.

A cold and moist brain is an inseparable companion to folly.

These days, most nature photographers are deeply committed to the environmental message

The chief merit of language is clearness.

Luckily, many other people tell me how they have had a particular landscape photograph of mine in their office or bedroom for 15 years and it always speaks to them strongly whenever they see it

The physician is only nature’s assistant.

If sometimes dreams come true, what of our nightmares?

Employment is nature’s physician, and is essential to human happiness.

All who drink of this remedy recover in a short time except those whom it does not help, who all die.

The combination of pictures and words together can be really effective, and I began to realise in my career that unless I wrote my own words, then my message was diluted

The chief merit of language is clearness, and we know that nothing detracts so much from this as do unfamiliar terms.

There are bad people who would be less dangerous if they were quite devoid of goodness.