The 4 Gospels are also tied to the 4 living creatures of Ezekiel and Revelation.
4 is also known as the number of creation. 4 seasons, 4 main compass points, 4 natural states of matter, 4 forces, 4 dimensions, 4 double-bonds in a carbon molecule which is element number 6. 6 is the Biblical number of ‘flesh’ or ‘man’. All life is carbon-based (element #6) which has 4 bonds pointing to the created origin of life (or flesh).
Also, Exodus 26:31-32. The Four Pillars on which the Cherubim-embroidered veil hung. The four pillars display the beautiful veil. The four Gospels display the perfection of God the Son tabernacled among men.
And how Rev. 4:6,7 authenticates the ORDER of the Four Gospel accounts. Everything in God's Word is there, and in His perfect order.