It is fitting that to “sojourn” in the Bible -- to live in a foreign land -- represents instruction, learning the things represented by that area. This is used quite a bit in the early parts of the Bible, when Abraham and his immediate descendants sojourned in a variety of foreign places. It arises also later in the Old Testament, with the Israelites given rules on how to treat sojourners in their midst.

The sojourner is a person who is willing to learn and accept new spiritual truths. That's in contrast to the term "stranger", as used in the Bible. A stranger has a natural inclination to good, but is not willing to learn spiritual truths. There is a long history of using travel to round out an education, from the 19th-century “world tours” taken by Oxford and Cambridge graduates to the exchange programs and semesters abroad offered in modern school programs. The idea is pretty straightforward: by immersing ourselves in other cultures we can both learn about them and deepen our minds.

6160. 'And for food for your young children' means in those things that are forms of innocence. This is clear from the meaning of 'food' as the good of truth, as immediately above in 6159; and from the meaning of 'young children' as innocence, dealt with in 430, 3183, 5608.