Excellent Advice from Jeremiah!

I think this is excellent advice.  Here is how I interpret it.

I think this is saying no matter what your strength is; be it wisdom, might, riches, or whatever; always recognize that your strength comes from God.  He is the one who provided that strength to you so don't be overly proud of your strengths. 

We may have done a lot to capitalize on our strengths that we were given such as study hard, etc; but we wouldn't have had the seed of that strength if it weren't for God.  Make sense?

Jeremiah 9:23-24(NKJV)

Thus says the Lord:      “Let not the wise man glory in his wisdom,     Let not the mighty man glory in his might,     Nor let the rich man glory in his riches;

    But let him who glories glory in this,     That he understands and knows Me,     That I am the Lord, exercising lovingkindness, judgment, and righteousness in the earth.      For in these I delight,” says the Lord.