Having what you want may give you Achievement. But wanting what you have will give you fulfillment.

A happy man is too satisfied with the present to dwell too much on the future.

Source: This quote is from a French essay “Mes Projets d’Avenir”, written on 18 September 1896 at age of 17 for a school exam by Albert Einstein. Original Sentence: Un homme heureux est trop content de la présence pour penser beaucoup à l’avenir.