Wear your learning like your watch, in a private pocket; and do not pull it out and strike it, merely to show that you have one.

What you know is more useful when it is not on display. Bringing out your knowledge to prove it exists changes the subject from the matter at hand to you, and people who do it are trusted less rather than more. Kept quiet, the same learning works on everything without anyone having to admire it.

In your next conversation, let one opportunity to demonstrate expertise pass. Answer what was asked and stop there. If your knowledge is real, it will show in the quality of the answer rather than in the size of it.