What you are really grateful for is the opportunity, not the thing that is given to you, because if that thing were somewhere else and you didn't have the opportunity to enjoy it, to do something with it, you wouldn't be grateful for it.
Por lo que estás realmente agradecido es por la oportunidad, no la cosa que nos es dada, porque si esa cosa lo fuera en otro lugar y no tuvieran la oportunidad de disfrutarla para hacer algo con ella, no estarían agradecidos por ello.