Here is a visual for you. In 2006 I drove my dad to a flea market in another town. We had the car loaded with magnetic gospel signs to give away for free. My dad sat on his walker and handed out gospel tracts.
I stood at the entrance, greeting people and handing them a tract. It was really hot, my back was screaming in pain, and I asked the Lord to help me. He gave me a picture of a box. Written on all four sides, “My Grace Is Sufficient For You.” I saw myself standing in that box. He gave me His grace-strength to endure.
Do you have a thorn in the flesh? Paul grasped what the Lord was saying. His next words can be ours as well. 2 Corinthians 12:9 says, “…Therefore most gladly I will rather boast in my infirmities, that the power of Christ may rest upon me.” The Greek word here for rest means to spread a tent over to dwell in.
His grace-strength endows us to do what He has called us to do and be.