It's a landmark for a young child to count to 100; it sort of covers all the "ordinary" numbers. One hundred is obviously significant for other groupings: 100 cents is a dollar; 100 yards is a touchdown; 100 years is a century, and the landmark for a very long life. It makes sense, then, that in the Bible, 100 represents fullness or a state of completion, or in some instances simply "much." For instance, people marvel that Abraham had Isaac when he was 100 years old; the number represents the point at which the Lord, when growing up as Jesus, united the human elements of himself with the divine elements and in a sense became "complete.

887. The waters abated from over the earth' means that all this was so because the obstructive falsities were now fewer. This is clear from the meaning of the same words that have appeared already in verse 8. As regards the obstructive falsities being fewer than previously in this second state which is the subject here, all the falsities a person has acquired so remain with him that not one is done away with, as stated already. But when a person is being regenerated truths are planted in him towards which falsities are turned by the Lord. It thus appears as though they have been dispersed, dispersed by means of the goods which he is given.