Crawling is something, even if one is unable to walk. Do your best. If you cannot preach an hour, then preach half an hour or a quarter of an hour. Do not try to imitate other people. Center on the shortest and simplest points, which are the very heart of the matter, and leave the rest to God. Look solely to his honor and not to applause. Pray that God will give you a mouth and to your audience ears.