Lynda, I believe that it was because the canon of Scripture and the apostolic age was coming to an end. The miracles that were done (in particular areas in a condensed period of time) were confirming the apostolic ministry and the dawning of the New Covenant era. He also told Timothy to take some wine for his stomach (1 Tim. 5:23).

True godliness is a sincere feeling which loves God as Father as much as it fears and reverences Him as Lord, embraces His righteousness, and dreads offending Him worse than death~ Calvin