There are things that we run too in order to quench our desire's thirst. Most, if not all of these external, earthly desires will leave you thirsty. You'll keep running back to them, only to find yourself even more thirsty. They will never satisfy, they will never fulfill in the ways you think they will. God's well will never run dry. That is the only sustainable, infinite source we should run too and pull from. Purpose, meaning, fulfillment...these are things that God provides.