God uses us in our foolishness.

26Brothers and sisters, think of what you were when you were called. Not many of you were wise by human standards; not many were influential; not many were of noble birth. 27But God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong. 28He chose the lowly things of this world and the despised things—and the things that are not—to nullify the things that are, 29so that no one may boast before him. 30It is because of him that you are in Christ Jesus, who has become for us wisdom from God—that is, our righteousness, holiness and redemption. 31Therefore, as it is written: "Let him who boasts boast in the Lord." (1Cor 1:26-31)

God uses us our foolishness. This is something that is illustrated all throughout church history. Did you know that most of the movers and shakers of the Christian faith down through the years had no formal training in theology or church administration, or Christian education? Most had never been to seminary.
Don't get me wrong, we need to be grateful to God for what he has given us by way of education, experience and ability. But we must recognize that the power to do significant things for God, does not come from us, it only comes from God's power. The minute we begin to think that we can stand on our own ability and our own strength, we have lost the ability to influence people for eternity and advance the Kingdom of God.
Therefore, what Paul is saying that if we ever get to the point where we believe that our strength and effectiveness for ministry resides in who we are or what we've received through formal education, or business experience, or human abilities, we have lost the opportunity for God's power to show itself in our lives.
If you think you aren't useful to God because you don't have much, think again. When you come to realize that you have nothing that God needs, that's when he can unleash his power through you.

Peace and love,

Sue

"Then Jesus said to them all: "If anyone would come after me, he must deny himself and take up his cross daily and follow me". (Luke 9:23)