One of the books I like to read from time-time is "See you at the top" by Zig Ziglar.
In this book in one of the sections, he mentions about how lot of us confuse activity with accomplishment and the importance of having a daily goal. A man or a woman without a goal is like a ship without rudder. Each will end up in the beaches of despair, defeat and despondency.
John Henry Fabre, the great naturalist conducted a most unusual experiment with some processionary caterpillars. These caterpillars blindly follow the one in front of them, hence the name. Faber carefully arranged them in a circle around the rim of a flower pot so that the lead caterpillar actually touched the last one, making a complete circle. In the center of a flower pot he put pine needles which is the food for processionary caterpillars. The caterpillar started around this circular flower pot. Around and around they went hour after hour, day after day, night after night for about 7 days (around the flower pot). Finally they dropped dead of starvation and exhaustion. With an abundance of food less than six inches away, they literally starved to death because they confused activity with accomplishment.