Think occasionally of the suffering of which you spare yourself the sight.

Until he extends the circle of his compassion to all living things, man will not himself find peace.

A man is ethical only when life, as such, is sacred to him, that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help. -Albert Schweitzer.

It is our duty to share and maintain life. Reverence concerning all life is the greatest commandment in its most elementary form. Or expressed in negative terms: “Though shalt not kill.” We take this prohibition so lightly, thoughtlessly plucking a flower, thoughtlessly stepping on a poor insect... Reverence for life comprises the whole ethic of love in its deepest and highest sense. It is the source of constant renewal for the individual and for mankind.

Let me give you a definition of ethics: It is good to maintain and further life it is bad to damage and destroy life.

I can do no other than be reverent before everything that is called life. I can do no other than to have compassion for all that is called life. That is the beginning and the foundation of all ethics.