यस्तु सञ्चरते देशान् सेवते यस्तु पण्डितान् ।
तस्य विस्तारिता बुद्धिस्तैलबिन्दुरिवाम्भसि ॥
yastu saMcharate deshan sevate yastu paMDitan
tasya vistaaritaa buddhistailbiMdurivaMbhasi
A person who travels in different-different countries, (‘desha’ can also be translated as direction here.). a person who serves scholars (learned person), his intelligence expands or develops as drop of oil on water surface. Often, a person who is very sharp is called ‘tailabuddhi’. When a drop of oil falls on water surface, it spreads over water and forms layer of oil; in that way a drop of oil ‘covers’ water surface (oil is taila in sanskrit). Similarly intelligence (buddhi) of a person (his grasping power) covers all the subjects. Here, subhasitkar says that, a person who travels a lot (and hence meets many people) and is in contact with ‘pundits’ develops his brain like that drop of oil in water.