Never complain and never explain.
It's always too early to quit.
Without hard work, nothing grows but weeds.
What you do today can improve all your tomorrows.
You never know what motivates you.
If you can dream it, you can do it.
Be thine own palace, or the world's thy jail.
If you're going through hell, keep going.
Be gentle to all and stern with yourself.
Quality is not an act, it is a habit.
The learner always begins by finding fault, but the scholar sees the positive merit in everything.
Mere goodness can achieve little against the power of nature.
Truth in philosophy means that concept and external reality correspond.