In another responsum he discusses whether a Gentile is obliged to pray to God, according to the Torah, since this is not one of the Noahide laws. The reply is that a Gentile has no obligation to offer prayer to God but it is counted to him as meritorious if he does.
Feinstein was often referred to as "the Great One of the generation," in other words, the world authority in Jewish law. In 1974, a Rabbi Schwartz published the work Reply to the Letters, in which he sought to demonstrate that Feinstein made many errors of judgment in his works and does not deserve the high title. Schwartz's critique was generally seen as unfounded and had no effect on Feinstein's reputation.
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