To what can this be compared? To a man who wanted to buy wine, oil, or honey, and walked into a store with an empty jug in hand. If the storekeeper is intelligent, he does not have to ask the customer which of the three he wants to purchase. All he needs to do is smell the man's jug; if it gives off the scent of wine, then he has come to purchase wine. If, however, the scent is that of honey, then he has come to buy honey.
So it is with wisdom. When Hashem sees a person that has some wisdom, He fills him with more!
Source: Rabbi Y. Bronstein