"Adapt. Evolve. And most importantly, assimilate.
When man looked out onto the world, he did not question how to make himself belong to it - he asked how to make it belong to him.
The first of what would soon be countless of animals we tamed was the canine. In it, we saw strength, ferocity, and loyalty. But we didn't hunch to all fours and growl at them, no - we took the canine and put into them something of our own selves. We took the wolf and made them, in the smallest way, human. We gave them names and identities where they had none. And we trained them to understand full subordination. The canine learned to give up it's life for the human.
We walked our planet, discontent with what we had. We adapted to the harshest of environments, living in places the non-humans would deem "unlivable," and doing it with the crudest technologies. We evolved to this task further, to walk across any land and live. And we assimilated. We were not nurtured by our planet, but instead nurtured it. We taught our crops to grow according to our whims. We allowed the animals to learn how best to live in servitude under us, so that they might advance their own destiny aside ours, by our wishes. Even in our religions, we forged gods not of the plants, but of ourselves. The oldest religions claim we were made in God's image, but now we know the truth - we made Him in ours.
Remember this, soldiers, when you leave this academy. This is our heritage. This is what it means to be human. The other races are content on borrowing their planets. We own them. That is our destiny - to walk alien lands, and tame them."