To know oneself, one should assert oneself.
Begin to be now what you will be hereafter.
Be kind whenever possible. It is always possible.
Never complain and never explain.
Expect problems and eat them for breakfast.
It's always too early to quit.
The secret of getting ahead is getting started.
The wise does at once what the fool does at last.
Know or listen to those who know.
If you think you can do it, you can.
As my dad said, you have an obligation to leave the world better than how you found it. And he also reminded us to be givers in this life, and not takers.