The Prophet -- by Kahlil Gibran
Kahlil Gibran wrote many general observations and truths in his 105-page The Prophet. It is largely centered around the informal ceremony of he and his family sailing away from the Middle East toward the United States.
It is all people-focused, and he covered a lot of ground before sailing away.
"Oftentimes in denying yourself pleasure you do but store the desire in the recesses of your being.
Who knows but that which seems omitted today, waits for tomorrow?
Even your body knows its heritage and its rightful need and will not be deceived."
He notes many balances in life which normally cannot be controlled by the average person. He was largely a poet and artist, often adding his own drawings to the 13 books he wrote.
Kahlil lived between 1883 and 1931. The Prophet was published in 1923.
Further reading about Kahlil can be found in This Man From Lebanon, A Study of Kahlil Gibran, by Barbara Young.