The opinion-page column "The Foreigner in Each of Us," Aug. 7, articulates how we are all "foreigners," and how the life of one person, or the freedom of one is no more fundamental than that of a "foreigner."My heart wants to agree in saying, "I am in favor of welcoming as many foreigners as generously as possible." But the concern the author articulates for the immigrant and for all people (including those who are unable to immigrate), should also include those who will be born five, 20, or 100 years from now, into regions where children are dying because there are too many people for the land and resources. The resources we have to help "foreigners" could best be used to enhance freedoms and standards of l iving and to slow the population increase in the countries where the "foreigners" now live. Steven C. Hill, Las Cruces, N.M. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.