Anyway, getting back to the above quote. The Northern Tribes, after they were deported and scattered, no longer observed the feasts given to their fathers by Moses. Likewise they quit observing the sabbaths. But then the Israelites of the Northern Kingdom stopped observing the sabbaths and the feast days once they broke away from the House of David (earlier).
It's been said that Israel--God's chosen people--are the ones who maintain the world we live in, by way of them imagining this world. And thus they sustain it. 1 Chronicles 29:17-18 says: "I know also, my God, that thou triest the heart, and hast pleasure in uprightness...O LORD God of Abraham, Isaac, and of Israel, our fathers, keep this for ever in the imagination of the thoughts of the heart of thy people, and prepare their heart unto thee." Well, the Israelites today are not using their imagination for "uprightness," for the most part. And they and the rest of the world are suffering severely because of this. The Anglo-Saxons--the foremost of Israel--are for the most part engulfed in great deception.
Anyway moving onto one Israelite author who really isn't helping, notwithstanding his superb ability as a writer. Grant Morrison has an understanding of Genesis 1 and John 1. I think he demonstrates this with a mini-series he wrote called "Final Crisis." This story seems to be the apocalypse for the DC Comics universe (multiverse). It ends with Superman saving the day by singing a song.
The universe began with sound frequency: words uttered by God, causing creation to come into existence. The Word was there in the beginning of creation. All of creation, Morrison is saying, is constructed from sound. According to Wikipedia, at the end of "Final Crisis," Superman is surrounded by darkness as he confronts the villain, Darkseid.
Just as verse 2 of Genesis 1 is the aftermath of the First War in Heaven: the earth was in chaos, and darkness was over the deep waters. Then God spoke and light appeared. "...and God divided the light from the darkness." (Gen. 1:3) This is a reflection of the spiritual: light and darkness cannot mix. "And the light shineth in darkness; and the darkness comprehended it not." (John 1:5)
And as Paul says in 2 Corinthians 6:14-15, "Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?"