In the song Speed of Sound by Coldplay, there are the following lines:
Every chance that you get, Is a chance you seize
What is the meaning of these lines? Do they mean that you should seize every chance that you get or that only the chances that you actually seize are the chances worth being labeled as the ones you got?
It is possible to use the declarative (here, "a chance you seize") as a kind of advice-giving, and "you" can be impersonal and mean "one". So, "a chance you seize|a chance one seizes" can be understood as "a chance one should seize or must seize". Compare: "You don't let a day go by without smelling the roses." which is semantically equivalent to "Never let...." or "You must not let..."
But to say whether those lyrics are giving advice is beyond the scope of this site, and would invite only opinion.
That said, I don't think your second possibility is viable, as you must get an opportunity before you can seize it. you get there means "you are presented" or "you are given". We can get many opportunities and seize none of them or only a few or only some of them. That we did or did not seize them has no bearing upon whether we got them. If you get a chance to take a shot on goal, you have gotten the chance whether you take the shot or not.
You miss 100% of the shots you don't take.
-- Wayne Gretzky (ice-hockey player)
