Perhaps one should not fixate merely on the prosperity. There is prosperity in other ways. Jesus said to sell it all and follow Him, to worry not about the morrow. Paul said that he learned to live prosperous in his poverty and lean in his times of prosperity. There is wealth in so much more such as in the relationships made just in doing God's word, there is a joy in His path, and fulfillment in His peace. And if bountiful material possession then more material possession to share. Prosperity is a state of being not a tally of possessions.
I have heard theories that Paul may have been crippled or have a deformity in arm or hand. We have already summized that he could well have problems with his eye sight. We also know that he was beaten and stoned near to death on several occasions and therefore be severely damaged. The Galatians here would have been deeply moved by whatever this sentence points to; he does bear the marks of Christ.
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