The anitya doctrine is, again, not quite the simple assertion that the world is impermanent, but rather that the more one grasps at the world, the more it changes.
I just want to live as a simple Buddhist monk, but during the last thirty years I have made many friends around the world and I want to have close contact with these people. I want to contribute to harmony and peace of mind, for less conflict. Wherever the possibililty is, I'm ready. This is my life's goal.
The rationale for loving others is the recognition of the simple fact that every living being has the same right to and the same desire for happiness, and not suffering, and the consideration that you as one individual are one life unit as compared with the mulititude of others in their ceaseless quest for happiness.
There is no other species on Earth that does science. It is, so far, entirely a human invention, evolved by natural selection in the cerebral cortex for one simple reason: it works. It is not perfect. It can be misused. It is only a tool. But it is by far the best tool we have, self-correcting, ongoing, applicable to everything.
Youth is like having a big plate of candy. Sentimentalists think they want to be in the pure, simple state they were in before they ate the candy. They don't. They just want the fun of eating it all over again.
I didn't want to work. It was as simple as that. I distrusted work, disliked it. I thought it was a very bad thing that the human race had unfortunately invented for itself.