One thing a man must have: either a naturally light disposition or a disposition lightened by art and knowledge.
There's nothing particularly dark in my past... I live in the light. My disposition is basically happy. I have a good life.
There is enough light for those who only desire to see, and enough obscurity for those who have a contrary disposition
I am determined to be cheerful and happy in whatever situation I may find myself. For I have learned that the greater part of our misery or unhappiness is determined not by our circumstance but by our disposition.
Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that.
Martin Luther King, Jr.