In the Bhagwad Gita, Lord Krishna says that one must not care about the result of his work. But if we do not think about the fruits that follow our hard and Smart work, then what will motivate us to do that hard work?
If you don’t think of the fruit, how would you know which direction to put your efforts in? Give your 100 percent, but know that there is no control over the fruit of action. If the attention is only on the end result, then you can’t perform. Let us take a runner - if he starts looking behind at whom is running, and not looking at the path he needs to run on, then ultimately he will lose, no matter how good the runner may be. You have to follow your own track, to complete the run whether you lose or win. Lord Krishna is utterly practical in his advises.