Who said “Men exist for the sake of one another.”?

“We are all of us, more or less, the slaves of opinion.”

“We are all dependent on one another, every soul of us on earth.”

“No man is an island entire of itself; every man is a piece of the continent, a part of the main.”

“The meeting of two personalities is like the contact of two chemical substances. If there is any reaction, both are transformed.”

“We are so bound together that no man can labor for himself alone. Each blow he strikes in his own behalf helps to mold the universe.”

“A man should be upright, not kept upright.”

“If it is not right do not do it; if it is not true do not say it.”

“Each thing is of like form from everlasting and comes round again in its cycle.”

“Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life.”

“Remember that what pulls the strings is the force hidden within; there lies the power to persuade, there the life -- there, if one must speak out, the real man.”

“If you are distressed by anything external, the pain is not due to the thing itself but to your own estimate of it; and this you have the power to revoke at any moment.”