Who said "I can't control the weather, but I can change my mood"? What is the original text like?

You can't change your appearance, but you can smile.

You can't control the weather, but you can change your mood.

You can't predict tomorrow, but you can grasp today.

You can't do everything smoothly, but you can try your best.

You can't decide the length of life, but you can expand its width.