John Calvin said of 2 Corinthians 4:12
“…it was unseemly that the Corinthians should live happily, and in accordance with their desire, and that they should, free from anxiety, take their ease, while in the mean time Paul was struggling with incessant hardships. Such an allotment would certainly have been exceedingly unreasonable. It was also necessary that the folly of the Corinthians should be reproved, inasmuch as they contrived to themselves a Christianity without the cross, and, not content with this, held in contempt the servants of Christ, because they were not so effeminate.”