Later came the clocks. They were first made about 2,000 years ago, but were very rude and awkward. The first watches were made about 475 years ago, but they were very large, and you would almost need to have a man to carry your watch for you, it was so heavy. Smaller watches were first made about 200 years ago, and now they have some that are so very small that you could carry six or seven of them in your vest pocket without inconvenience. How else could we tell about the time of the departure of trains and steamboats, the hours to go to work in the factory or to go to school, when to go to church? And the enjoyment of many other things depends upon knowing accurately what moment we should be on hand. You should learn never to be late, but always to be prompt. Suppose that, with an audience of six hundred people, the preacher should be five minutes late. Each person would then have lost five minutes. This, for the entire six hundred present, would have been equal to more than forty-eight hours for a single person--more than two days and two nights. But now what is it that makes time valuable? It is the use that we can make of it. David wanted to know about it, so that he could apply his heart unto wisdom. The man who does nothing with his time, in the eyes of others, is worth nothing; but the busy man always finds that his time is very valuable. It is strange, also, that when you go to idle people and ask them to do anything they always say they haven't time, so that the expression has come to be used that "if you want anything done go to a busy man." The more busy the man is the more likely he is to find time, in some way, to undertake any new form of useful endeavor and work.