Let your thoughts be ruled by principle, and then live up to your thoughts.
...you can render to God and humanity no greater service than to make the most of yourself.
If you are not happy in your work, you are a slave.
It is essential to his happiness that he should continually advance.
You must learn to see the world as being produced by evolution; as a something which is evolving and becoming, not as a finished work.
The scientific use of thought consists in forming a clear and distinct mental image of what you want; in holding fast to the purpose to get what you want; and in realizing with grateful faith that you do get what you want.