Since when do the Gentiles have a responsibility to take care of the house of Israel? What does Mormon mean by this statement? Isaiah prophesied, Behold I will lift up mine hand to the Gentiles, and set up my standard to the people; and they shall bring thy sons in their arms, and thy daughters shall be carried upon their shoulders (1 Nephi 21:22). Nephi interpreted this passage as follows:
'Nevertheless, after they (the House of Israel) shall be nursed by the Gentiles, and the Lord has lifted up his hand upon the Gentiles and set them up for a standard, and their children have been carried in their arms, and their daughters have been carried upon their shoulders, behold these things of which are spoken are temporal; for thus are the covenants of the Lord with our fathers; and it meaneth us in the days to come, and also all our brethren who are of the house of Israel.
And it meaneth that the time cometh that after all the house of Israel have been scattered and confounded, that the Lord God will raise up a mighty nation among the Gentiles, yea, even upon the face of this land; and by them shall our seed be scattered.
And after our seed is scattered the Lord God will proceed to do a marvelous work among the Gentiles, which shall be of great worth unto our seed; wherefore, it is likened unto their being nourished by the Gentiles and being carried in their arms and upon their shoulders.
And it shall also be of worth unto the Gentiles; and not only unto the Gentiles but unto all the house of Israel, unto the making known of the covenants of the Father of heaven unto Abraham, saying: In thy seed shall all the kindreds of the earth be blessed.' (1 Nephi 22:6-9)
Spencer W. Kimball
"A loving father does not despise his children. These [Lamanites] are a chosen people, and this Church has an important part in restoring them to their rightful inheritance. The chasm between what they are and what they will be is opportunity. The gospel furnishes that opportunity; it is ours to give." (Ensign, Dec. 1975, p. 7 as taken from Latter-day Commentary on the Book of Mormon compiled by K. Douglas Bassett, p.70)