Horses Become Discouraged Trying to Pull a Heavy Load

I saw a span of horses drawing a very heavy load of logs, and as they came to a hard place they struggled and tried with all their force, strained every muscle to the highest tension, but they could not start the load. Then the driver took some of the logs off and tried to get them to start the load, but they would not. He rolled off some more, but those horses would not start. He rolled off still more, and at last took off every log, and then they started up the road. Those horses had been utterly discouraged; they had pulled with all their strength and failed, and any one doing that, be it man or beast, is not able to accomplish half as much as a man who has not lost heart. (Source Unknown).