'Deep' in the Bible

So today be certain, and keep the knowledge deep in your hearts, that the Lord is God, in heaven on high and here on earth; there is no other God.

Keep these words, which I say to you this day, deep in your hearts;

For the Lord your God is guiding you into a good land, a land of water-springs, of fountains, and deep streams flowing out from the valleys and the hills;

So keep these words deep in your heart and in your soul, and have them fixed on your hand for a sign and marked on your brow;

For my wrath is a flaming fire, burning to the deep parts of the underworld, burning up the earth with her increase, and firing the deep roots of the mountains.

Moses said to them, Let the words which I have said to you today go deep into your hearts, and give orders to your children to do every word of this law.

And of Joseph he said, Let the blessing of the Lord be on his land; for the good things of heaven on high, and the deep waters flowing under the earth,