CHANGE
A small group of thoughtful people could change the world. Indeed, it's the only thing that ever has.
I can't really change my life to accommodate people who are jealous. I don't see why I should.
One must change one's tactics every ten years if one wishes to maintain one's superiority.
one must change, tactics, ten years, wishes, maintain
They must often change, who would be constant in happiness or wisdom.
change, constant, happiness, wisdom
If you're in a bad situation, don't worry it'll change. If you're in a good situation, don't worry it'll change.