Spiritually, "beginning" happens when we first start new growth -- new levels of awareness and willingness to receive goods and truths from the Lord, and use them. In the Word, "beginning" doesn't just mean the beginning of something in time. In the inner sense, it means the initial phase of a spiritual state.

1014. Verse 7 And you, be fruitful and multiply; swarm over the earth and multiply in it.

'Be fruitful and multiply' here, as previously, means increases in good and truth in the interior man, 'being fruitful' having reference to goods, and 'multiplying' to truths. 'Swarm over the earth and multiply in it' means increases in good and truth in the external man, which man is 'the earth' - 'swarming' having reference to goods, 'multiplying' to truths.