Dig a well in sand and the water rises to meet the depth of your digging — go deeper, get more. Thiruvalluvar makes learning that sand-well. Wisdom is not a fixed cup you fill once; it is a spring that answers effort, giving in proportion to how far you are willing to reach. The image is generous and demanding at once: there is always more water below, but only for the one who keeps digging. Curiosity, read this way, is not restlessness — it is the digging that keeps the spring alive.