Knowledge

न् चोरहार्यम् न् च् राजहार्यम् न् भ्रातृभाज्यं न् च् भारकारि ।
व्यये क्रृते वर्धत् एव् नित्यं विद्या धनं सर्व् धन: प्रधानम् ॥


Knowledge is the best of all kinds of wealth.. no one can steal it from you.. a tyrannical king can't take it away from you.. it cannot be divided among the siblings( like the hereditary wealth) .. and the most important thing is , when you spend this wealth (i.e share your knowledge with somebody) instead of reducing .. It grows even more