Bad company leads to one's degradation.
The thankless and the ungrateful have special reservations in hell. 😈
Dharma is the root of whole existence.
Both Immortality and Death are planted in the body. Death is encountered from folly, and immortality is won by Truth.
As two pieces of wood floating on the ocean come together at one time and are again separated, even such is the union of (living) creatures in this world.
^ Against attachment.
One should always ponder over one's faults and weaknesses.
Contentment does not result from acquisition of desirable objects. Thirst is never slaked although there is profusion of water. The thirst for acquisition only blazes up with each fresh acquisition like a fire with new faggots thrown into it. In thee there is grief. But joy also dwells in thee. Both happiness and misery dwell in thee. Why then shouldst thou yield to grief?
^ Bheeshm tells this to Yudhisthira. Easily one of my most favourite quotes.