The wicked exist in this world either to be converted or that through them the good may exercise patience. Augustine of Hippo
Security is mostly a superstition. 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. Helen Keller
We only exist in terms of how we think we exist. Meaning every cultural development is fabricated and can be fabricated. Thom Mayne
Borders I have never seen one. But I have heard they exist in the minds of some people. Thor Heyerdahl
We have no right to assume that any physical laws exist, or if they have existed up to now, that they will continue to exist in a similar manner in the future. Max Planck
There is only one inborn error. and that is the notion that we exist in order to be happy. Arthur Schopenhauer