He who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.
You don't need a uniform color: We used a mixture of brick red, browns and grays, and then threw in seashells, branches and various types of rock, so our walls ended up looking like cave paintings!
The more everybody knows about all aspects of the problems we face, the better off all of us will be. Less time spent explaining things means more time for coming up with creative solutions.