Chief Seattle
"Every part of the Earth is sacred,
You are a part of the Earth
and the earth is a part of you.
You did not weave the web of life,
you are merely a strand in it.
Whatever you do to the web,
you do it to yourself." (Chief Seattle)
Zoroaster
"Be good, be kind, be humane and charitable; love your fellows, console the afflicted, pardon those who have done you wrong." (Zoroaster)
Buddha
"In dealing with others, one should do as he would have done him." (Buddha)
Mohammed
"Let none of you treat his brother in a way he himself would dislike being treated." (Mohammed)
Confucious
"Do not do to others that which you would not they do to you." (Confucious)
Jesus
"All things whatsoever ye would that men do unto you, do you even unto them." (Jesus)
Cayce
"As ye mete to others, it comes back to thee. As ye would that others should do to thee, do ye even so to them." Cayce (1688-9)
Rudolf Steiner
"The golden rule of true spirit[ual] science: For every one step that you take in the pursuit of higher knowledge, take three steps in the perfection of your own character." [Rudolf Steiner]
See Also
As a Man Thinketh
Giving-Regiving
Karma
Rhythmic Balanced Interchange
Three Laws of Being
Truth as Force