Charles H. Spurgeon on Psalms 99:1

He sitteth between the cherubims. The cherubim is the seat of God, as the scripture sheweth us, a certain exalted heavenly throne, which we see not; but the word of God knoweth it, knoweth it as his own seat: and the word of God and the Spirit of God hath itself revealed to the servants of God where God sitteth. Not that God doth sit, as doth man, but thou, if thou dost wish that God sit in thee, if thou wilt be good, shalt be the seat of God; for thus is it written, "The soul of the righteous is the seat of wisdom" Septuagint translation]. For a throne is in our language called a seat. For some, conversant with the Hebrew tongue, have interpreted cherubim in the Latin language (for it is a Hebrew term) by the words fulness of knowledge. Therefore, because God surpasses all knowledge, he is said to sit above the fulness of knowledge. Let there be therefore in thee fulness of knowledge, and even thou shalt be the throne of God. Augustine.