What is hell and what is Buddha?

First of all, as to the question of where exactly hell and the Buddha exist, one sutra states that hell exists underground, and another sutra says the Buddha is in the west. Closer examination, however, reveals that both exist in our five-foot body. This must be true because hell is in the heart of a person who inwardly despise his father and disregards his mother. It is like the lotus seed, which contains both blossom and fruit. In the same way, the Buddha dwells within our heart

- Nichiren