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.

3504.'So that my soul may bless you' means allying it to its own life, consequently life that corresponds to the rational. This is clear from the meaning of 'being blessed' as being endowed with celestial and spiritual good, dealt with in 981, 1731, 2846, 3017, 3406. For the good of early childhood and consequently the good of life, which is the same as the good of the natural, and which is represented by 'Esau', is not spiritual good, for the good of early childhood is devoid of knowledge and intelligence, and so of wisdom. The good of early childhood becomes spiritual good through the implantation of truth, and so through regeneration, see 1616, 1802, 2280, 2290, 2291, 2299, 2304, 2305, 2307, 3494 (end). This is how the correspondence between rational things and natural is effected, and so how the allying of the natural man to the life of the rational is effected. This allying to its own life is what is meant by 'my soul may bless you'.