'Deep' in the Bible

You have not for the second time acquired the consciousness of being--a consciousness which fills you with terror. But you have acquired a deep inward conviction of having been adopted as sons--a conviction which prompts us to cry aloud, "Abba! our Father!"

In the same way, the Spirit also helps us in our weakness, since we do not know how to pray as we should. But the Spirit himself intercedes for us with groans too deep for words,

I have deep sorrow and unceasing anguish in my heart,

Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)

As it is written, "To this day God has put them into deep sleep. Their eyes do not see, and their ears do not hear."

O how deep are God's riches, and wisdom, and knowledge! How unfathomable are his decisions and unexplainable are his ways!