To be alone in the Bible represents being free of evil and false influences. That's why the Lord seeks solitude to pray, and why the nation of Israel is often described as "dwelling alone." When "alone" is used in reference to ownership – when something is "his and his alone" – the meaning is more literal.

In Genesis 2:18, man being alone signifies that the first men became unwilling to be led by the Lord, desiring to lead themselves. In ancient times people who were "Alone" constituted those led by the Lord as celestial men, and evil spirits no longer infested them. But the Jewish church was not meant to be fully under the Lord's guidance and desired to be among the other nations (away from God); and as one who desires is already in evil, this was granted. (Arcana Coelestia 138, 139)

In Genesis 32:24, being alone or by himself signifies good and truth procured. (Arcana Coelestia 4273)

In Exodus 18:14, being alone signifies a state without influx of truth from good from any other source. (Arcana Coelestia 8689)

In Psalm 102:7, alone by itself signifies something of insignificance, and without relative assocation. The state of being alone here symbolizes a prayer of the Lord when in temptations even to despair. (The Inner Meaning of the Prophets and Psalms 352)

In Psalm 136:4, the Lord alone signifies that only the Lord has formed heaven and the church by means of His Divine Truth. (The Inner Meaning of the Prophets and Psalms 386)

4273. 'Jacob remained alone' means the good of truth, which had now been arrived at and was at this point the ultimate form of good. This is clear from the representation of 'Jacob' at this point as the good of truth. What 'Jacob' had represented has been shown in previous paragraphs, as also has the fact that he represented varying relationships of good and truth within the natural. For these exist together in one condition at the beginning of a process, in another during it, and in yet another at the end of it, 3775, 4234. At present he represents the good of truth. The reason for this representation is that the subject dealt with next is his wrestling, which in the internal sense means temptation, and that he was named Israel, after which he represents the celestial-spiritual man. And a further reason is that after that wrestling his reunion with Esau is described, by which the introduction of truth into good is meant. These are the reasons why 'Jacob' now represents the ultimate form of the good of truth within the natural.