Arcana Coelestia #43
43. Verse 22 And God blessed them, saying, Be fruitful and multiply, and fill the waters in the seas; and let birds be multiplied upon the earth.
Everything that has life in it from the Lord is fruitful and multiplies without limit. This does not happen during a person's lifetime, but in the next life it does so to an astonishing extent. In the Word 'to be fruitful' has reference to matters of love, while 'to multiply' has reference to matters of faith. The fruit of love contains the seed by which it multiplies itself to so great an extent. The Lord' s blessing also means, in the Word, fruitfulness and multiplication, for they are the outcome of that blessing.
Verse 23 And there was evening, and there was morning, a fifth day.
Arcana Coelestia #8877
8877. 'On the third and on the fourth [generations]' means in a long sequence, and joined together. This is clear from the meaning of 'three' as what is complete from start to finish, dealt with in 2788, 4495, 7715, thus a long sequence, so that 'the third [generation on sons' is falsities in a long sequence (for the meaning of 'sons' as falsities, see immediately above in 8876); and from the meaning of 'four', like two, as joined together, dealt with in 1686, 5194, 8423, so that 'the third and the fourth [generations of] sons' are falsities joined together in a long sequence. This explanation of 'the third and the fourth [generations of] sons' must inevitably seem to be nonsensical or foreign to the meaning of the Word; but it should be remembered that in the internal sense numbers do not mean numbers but real things, see 482, 487, 575, 647, 648, 755, 813, 1963, 1988, 2075, 2252, 3252, 4264, 4495, 4670, 5265, 6175.