What is your favorite quote?

My most favorite quote is “Live as if you were to die tomorrow. Learn as if you were to live forever”. I think the essence is to make best use of life and do it to make you eternal in the mind of others. It also tells us that learning is a continuous process and whole life is a learning process. Below quotes also seem quite inspirational to me:

“Yesterday is history, tomorrow is a mystery, today is a gift of God, which is why we call it the present”

“You only live once, but if you do it right, once is enough”