At the start of the 4th chapter of the Gita, the Lord tells Arjuna, “I revealed this yoga to the Sun god, Vivaswan, Manu, Ikshvaku. It got lost by passage of time. The same is told to you now.”
Can you believe it? The most important knowledge in the world, nay not even the world, of all creation. In fact the secret of creation itself…lost!
What does this tell us?
That with the passage of time, everything is lost.
Grandpa plants a seed, three generations later, the kids are okay to cut down the tree to construct their home. Parents save a fortune, only to see it frittered away by the next layer. Bulbs, telephones, car models, women confined to the kitchens – you name it, and it will change.
What do we learn from this? Not to be (too) attached to anything. Because the expectation that we should preserve anything forever, is just foolishness.