This is what I sometimes try to remind myself...

The law of conservation of energy states:
energy can neither be created nor destroyed,
it can only be transformed or transferred.

The energy that gave us life was transferred to us from the many generations before us and the ways they channeled their energies into shaping the world around them during their lifetimes.

The energy we radiate into this universe echoes through eternity, from our interactions with others, from our creations, from our efforts, from our struggles, from our triumphs, & from our love.

We have limited lifespans, but we are part of an infinite flow of energy.
What we do with the energy available to us in our lives affects the well of energy around us & after us.
That's why what we do matters.