All you have to do is to pay attention; lessons always arrive when you are ready, and if you can read the signs, you will learn everything you need to know in order to take the next step
Look not back. No, not even if you see the dearest and nearest cry. Look not back, but forward. We cannot stop. If we stop we die. We have either to go forward or to go backward. We have either to progress or to degenerate.
I believe that the very purpose of life is to be happy. From the very core of our being, we desire contentment. In my own limited experience I have found that the more we care for the happiness of others, the greater is our own sense of well-being.