Let me give you a definition of ethics: It is good to maintain and further life it is bad to damage and destroy life.
Albert SchweitzerThe great secret of success is to go through life as a person who never gets used up. That is possible for those who never argue and strive with people and facts, but in all experience retires upon themselves, and look for the ultimate cause of things in themselves.
Albert SchweitzerVery little of the great cruelty shown by men can really be attributed to cruel instinct. Most of it comes from thoughtlessness or inherited habit. Extract from 'Memories of childhood and youth.'
Albert SchweitzerThe thinking man must oppose all cruel customs no matter how deeply rooted in tradition or surrounded by a halo. We need a boundless ethics which will include the animals also. My life is full of meaning to me. The life around me must be full of significance to it. If I want others to respect my life, then I must respect the other life I see however strange it may be to mine. Ethics in our western world has hitherto been largely limited to the relation of man to man... but that is a limited ethics.
Albert Schweitzer