Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
The only true wisdom is in knowing you know nothing.
Difficult roads often lead to beautiful destinations.

It does not matter how slowly you go as long as you do not stop.
The only limit to our realization of tomorrow will be our doubts of today.
The only place where success comes before work is in the dictionary.
In the middle of difficulty lies opportunity.
You miss 100% of the shots you don't take.

The only thing necessary for the triumph of evil is for good men to do nothing.
The best way to predict the future is to create it.
It always seems impossible until it's done.

Life is what happens when you're busy making other plans.
Life is 10% what happens to us and 90% how we react to it.
Happiness is not something ready-made. It comes from your own actions.
If you want to lift yourself up, lift up someone else.
Believe you can and you're halfway there.
The only way to do great work is to love what you do.
Success is not final, failure is not fatal: It is the courage to continue that counts.

Difficulties are just things to overcome, after all.