As the Bhagavad Gita beautifully puts it, moderate in your eating, moderate in your activity, moderate in your speech, moderate in your sleep form the golden mean, the via-media, the golden path. God is the harmony of all powers in the universe. Harmony means the middle course, neither this extreme nor that extreme. You cannot say whether it is or it is not. God is in the middle.
Truth is in the middle.
So, the middle path is the best path, which is the path of austerity with understanding. This is the characteristic of the middle path. When there is understanding without austerity, it is useless. When there is austerity without understanding, that is also useless. That is of no use.