Here are several quotes that revolve around the question:
What do you desire?

You tend to become like what you admire. Admiration breeds imitation.
– John Piper

The goal of life is to forget me and be thrilled with him.
– John Piper

When I really enjoy God, I feel my desires of Him the more insatiable
and my thirst after holiness more unquenchable.
– David Brainerd

We care for one thing: Does the Jesus Christ, the Lord
of heaven and earth, approve of what I am saying and doing?
– John Piper

When the day comes that only righteousness pleases you,
on that day you may do as you please – with no regrets.
– John Piper