Note 23 — I.

The transmigration of the soul into another body, however, is restricted to three times; and if two souls in their third residence in human bodies are still too weak to resist all earthly trammels and to acquire the necessary experience, they are both united and sent into one body, so that they may be able conjointly to learn that which they were too feeble to do separately. It sometimes, however, happens that it is the singleness and isolation of the soul which is the source of her weakness, and she requires help to pass through her probation. In that case she chooses for a companion a soul which has more strength and better fortune. The stronger of the two then becomes as it were the mother; she carries the sickly one in her bosom, and nurses her from her own substance, just as a woman nurses her child. Such an association is therefore called pregnancy (‏עיבור‎), because the stronger soul gives as it were life and substance to the weaker companion.23