There is no power on earth that can neutralize the influence of a high, simple and useful life. Booker T. Washington
Guard well your spare moments. They are like uncut diamonds. Discard them and their value will never be known. Improve them and they will become the brightest gems in a useful life. Ralph Waldo Emerson
Purify yourself by a well-ordered and useful life. Watch over your thoughts, feelings, words and actions. This will clear your vision. Nisargadatta Maharaj
I have lived an honest and useful life to mankind; my time has been spend in doing good and I die in perfect composure and resignation to the will of my Creator, God. Thomas Paine
As a child, I was aware of the widely-held attitude that the ocean is so big, so resilient that we could use the sea as the ultimate place to dispose of anything we did not want, from garbage and nuclear wastes to sludge from sewage to entire ships that had reached the end of their useful life. Sylvia Earle
Live a good and useful life. Indonesian Proverb