Our teacher explained to us that the most selfish thing one can do is serve the happiness of others, due to the universe's feedback loop that feeds the happiness we've sown in our treatment of others back into what we reap within our inner world.

This is the most fundamental law of the human universe, and we all live under its iron fist as its gears grind our life's chosen actions' butterfly wingbeats back into us in perfect harmony with the frequency we emanated out into others, consonant or dissonant, loving or selfish, kind or cruel, generous or callous.

In addition, there are amplifiers and attenuators for both the positive and negative, especially at the narrow ends of our potentials' bell curve, so we best be careful how we wield our free will and the energy we possess to affect the world.

Ignoring this law does not change a person's situation, just their foundation for how they construct their custom decision-tree methodology of preference and habit, thus establishing their inertias and ability to self-reflect. This is because we are free to ignore the truth, just as we are fully free to be the biggest narcissistic asshole we can be given our station in life.

To boot, we're all doing this within multiple layers of our cultures' inertias that contribute to our perspective, once again, as per our choices.

Within it all, at the very center, is the most precious and perilous gift in the universe: our free will, mind, and body co-existing tripartite on this beautiful planet Earth.