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The hardest thing in life to do is to change.

I can't go against my nature because I am what I am. I don't try to be anyone different to who I am.

If you feel like it's difficult to change, you will probably have a harder time succeeding.

Sometimes the hardest thing to do is just to stay human.

As long as I retain my feeling and my passion for Nature, I can partly soften or subdue my other passions and resist or endure those of others.

The difficult thing for me is that I want basically to be a good man. That's what I want to be.

You can't think about things you want to change. Just be yourself.

Changing the world is not easy, but its pursuit will change you profoundly.

Mother Nature made me the way I am, and I should be happy.

Changing your mind is probably one of the most beautiful things people can do. And I've changed my mind about a lot of things over the years.