“Things yet unknown will change the way you think.”
“What you're supposed to do when you don't like a thing is change it. If you can't change it, change the way you think about it. Don't complain.”
“Make every effort to change things you do not like. If you cannot make a change, change the way you have been thinking. You might find a new solution.”
“Change the way you look at things and the things you look at change.”
“When you change the way you look at things; the things you look at change.”