Why did Paul write his letters in huge block letters?
Paul evidently wrote in huge block letters because his thorn in the flesh was likely a painful eye disease that limited his eyesight. He wrote that way for his own sake, not for his readers, so that he could read what he had written.
Les explains that Paul's thorn in the flesh is not claimed to have only one answer, but the logical view is a common eye disease of that period. It was repulsive in appearance, painful, and limited his eyesight. Consequently, Paul dictated all his letters, seemingly except Galatians, and evidently had to write the whole letter in huge block letters for his own sake, not for those to whom he was writing, so he could read it. This fits the II Corinthians 12 discussion of his buffeting and the Lord's sufficient grace.
Ye see how large a letter I have written unto you with mine own hand.
More Questions
Why did Paul say he wrote to the Galatians with such large letters?
Paul had to write in large letters because of his poor eyesight/blindness, which is what he refers to when he says 'you see what large letters I write.'
Why does Paul say 'see with what large letters I write' in Galatians?
Because of his blindness, Paul could not see small print and had to print in large figures, which is what he refers to when he says, 'you see what large letters I write.'