It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure.
Life is either a daring adventure, or nothing.
To keep our faces toward change and behave like free spirits in the presence of fate is strength undefeatable. If you think you can, or if you think you can't, you're right. Only those who dare to fail greatly can achieve greatly. If I had my life to live over, I'd dare to make more mistakes next time. I'd relax, I'd limber up.