Albert Einstein:

Physicist and Nobel Prize Winner: as quoted in: Peace: A Dream Unfolding.  Edited by Penney Kome and Patrick Crean:

A human being is a part of the whole, called by us the 'Universe' - a part limited in time and space.  He experiences himself, his thoughts and feelings, as something separated from the rest - a kind of optical delusion of his consciousness.  This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us.

Our task must be to free ourselves by widening our circle of compassion to embrace all living creatures and the whole of Nature in its beauty.