All changes of place in the Bible represent changes in spiritual state. “Entering” – usually used as entering someone’s house or “going in unto” someone – particularly means adopting a spiritual state that is compatible with someone else in order to communicate with them or be conjoined with them. This is easily seen in the fact that a man “going in unto” a woman is sort of a Biblical euphemism for a physical relationship. In a broader sense, all the spiritual changes we go through in our lives involve “entering” and “leaving,” so when the Bible uses the phrasing “going in and coming out,” it symbolizes someone’s entire spiritual life.

To enter, as in Genesis 7:1, signifies to be prepared.

4518. 'And I am [a few] mortals in number' means that it would be easy.... This is clear from the meaning of 'mortals in number' as a few. But when the train of thought in the internal sense refers to the quality of something instead of its quantity, that which is easy is meant. For when many are gathered together against them, as mentioned next, those who are a few are easily destroyed.