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.

899. Verse 14 And in the second month, on the twenty-seventh day of the month, the earth was dry.

'The second month' means the whole of the state prior to regeneration. 'The twenty-seventh day' means that which is holy. 'The earth was dry' means that he was regenerated. These words form the conclusion to what has gone before and the starting point to what follows.