I learned that if you work hard and creatively, you can have just about anything you want, but not everything you want. Maturity is the ability to reject good alternatives in order to pursue even better ones.
Ray Dalio, Principles: Life and Work
Links with another favourite quote of mine “Be careful what you wish for, you might end up getting it”. Both speak to the power of focus to achieve your desires, but to be clear about what you desire and why because not only does what you desire not always have a positive impact, but it can prevent you achieving the happiness you would have achieved if you’d pursued a different goal.