We Find That The More

Cruelty To Animals Is Contrary To Man's Duty To Himself, Because It Deadens In Him The Feeling Of Sympathy For Their Sufferings, And Thus A Natural Tendency That Is Very Useful To Morality In Relation To Other Human Beings Is Weakened.

Have The Courage To Use Your Own Reason- That Is The Motto Of Enlightenment. "foundations Of The Metaphysics Of Morals" (1785)

Man's Duty Is To Improve Himself; To Cultivate His Mind; And, When He Finds Himself Going Astray, To Bring The Moral Law To Bear Upon Himself.

Live Your Life As Though Your Every Act Were To Become A Universal Law.

This Can Never Become Popular, And, Indeed, Has No Occasion To Be So; For Fine-spun Arguments In Favour Of Useful Truths Make Just As Little Impression On The Public Mind As The Equally Subtle Objections Brought Against These Truths. On The Other Hand, Since Both Inevitably Force Themselves On Every Man Who Rises To The Height Of Speculation, It Becomes The Manifest Duty Of The Schools To Enter Upon A Thorough Investigation Of The Rights Of Speculative Reason, And Thus To Prevent The Scandal Which Metaphysical Controversies Are Sure, Sooner Or Later, To Cause Even To The Masses.