It's rare - too rare, I have to say - for botanists to become doctors.

I think instead [of happiness] we should be working for contentment... an inner sense of fulfillment that's relatively independent of external circumstances.

The notion that a human being should be constantly happy is a uniquely modern, uniquely American, uniquely destructive idea.

I've always been willing to take risks and chances. Often I'm on talk shows and hosts will ask 'How do you feel about it, when people say you're controversial?' And I say that, 'I think if I stop being controversial, I wouldn't be doing my job.

Another aspect of the psychedelic vision for me that has been very profound, is the sense that every-thing is alive or at that at least, there is no distinction between what we call living and non-living.

Improper breathing is a common cause of ill health. If I had to limit my advice on healthier living to just one tip, it would be simply to learn how to breathe correctly. There is no single more powerful -or more simple- daily practice to further your health and well being than breathwork.

Just the attempt to learn a [new] language is like running different software through the brain.