"Ambient chakra is a mixture of numerous subtypes of chakra, which, apart from human chakra for humans and nature chakra for summons, are currently impossible to interact with, survey, and study. All humans possess an affinity for human chakra, though only ninja are capable of using it effectively."
"So when a ninja uses chakra…" Hazō said.
"They are solely using a single phase of chakra. A human's chakra coils filter human chakra from the ambient mixture – analogous to lifting a stone up to the top of a hill. It creates tension and latent movement. The boulder wishes to roll down the hill and gains speed and power by doing so. Its movement can knock down trees if released correctly. In the same way, filtered chakra within a human's coils can be returned to the ambient mixture in such a way as to produce useful effects. This naturally disproves the explanation provided to you of nature chakra – were it simply a broader set of components from the ambient mixture, it would require less work to separate, and would thus release less energy when used in ninjutsu. Instead, nature chakra releases more energy when used."