Competition has been shown to be useful up to a certain point and no further, but cooperation, which is the thing we must strive for today, begins where competition leaves off. Franklin D. Roosevelt
Don't try to be useful. Try to be yourself: that is enough & that makes all the difference. Paulo Coelho
Be useful where thou livest. George Herbert
To some extent, people who are insane are nonconformists, and society and their family wish they would live what appear to be useful lives. John Forbes Nash
Ask for a science that would be useful to you, would keep you from harm and shame, then elevate you. Arabic Proverb
Do not spit into a well-it may be useful to drink water. Russian Proverb