There is no scripture which tells us exactly what Paul's "thorn in the flesh" was. However, it is generally believed that it was probably an eye impairment. When Paul, (then named Saul), was traveling to Damascus to persecute the Lord’s disciples, he was struck blind by the brightness of Jesus’ presence. "Saul, Saul, why persecutest thou me?….and he was there three days without sight."  Acts 9:4, 9  Although Paul was a well-educated man, he depended on others to assist him in writing down his epistles.  "See what big letters I make, when I write you in my own hand!" Galatians  6:11 (Moffatt)

Continuing in the scripture cited, "To keep me from becoming conceited because of these surpassingly great revelations, there was given me a thorn in the flesh, a messenger of Satan, to torment me. Three times I pleaded with the Lord to take it away from me. But He said to me, 'My grace is sufficient for you, for my power is made perfect in weakness.'  Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me. That is why, for Christ's sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong." II Corinthians 12:7-10  (NIV)

Yes, our suffering teaches us humility, compassion, wisdom, obedience, gentleness, etc. We should daily strive to be like Paul, and “Thank God in everything–no matter what the circumstances may be, be thankful and give thanks; for this is the will of God for you who are in Christ Jesus.”  I Thessalonians 5:18 (Amplified)