Knowledge gained by education is likened by Valluvar to the spring of water in a well. Human mind is like a well dug in sand. The spring of knowledge is but natural as much as the spring of water in sand. All that you need to do to get water is to dig the sand. The more you dig the more you get! The result corresponds to your effort whether it is to draw water or to gain knowledge. What a beautiful simile to describe the hidden potential of knowledge and the effort that is required to bring it to light. And see the aptness in comparing water to knowledge. There cannot be any life without water: there cannot be any meaning in living without 'knowledge'.