The great fault of all ethics hitherto has been that they believed themselves to have to deal only with the relations of man to man. In reality, howe… - Albert Schweitzer

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.

The ethic of Reverence for Life prompts us to keep each other alert to what troubles us and to speak and act dauntlessly together in discharging the responsibility that we feel. It keeps us watching together for opportunities to bring some sort of help to animals in recompense for the great misery that men inflict upon them, and thus for a moment we escape from the incomprehensible horror of existence.

I do not believe that we can put into anyone ideas which are not in him
already. As a rule there is in everyone all sorts of good ideas, ready
like tinder. But much of this tinder catches fire, or catches it
successfully, only when it meets some flame or spark from the outside,
from some other person. Often, too, our own light goes out, and is
rekindled by some experience we go through with a fellow man. Thus we
have each of us cause to think with deep gratitude of those who have
lighted the flame within us. If we had before us those who have thus
been a blessing to us, and could tell them how it came about, they would
be amazed to learn what passed over from their life to ours.

An optimist is a person who sees a green light everywhere, while the pessimist sees only the red stoplight. The truly wise person is colorblind.