In the sefer Chafetz Chaim al HaTorah [Va’eschanan] the Chafetz Chaim explains why the posuk of “ vi’nishmartem meod l’nafshoseichem ”, which includes the commandment to guard one’s health, uses the term of nefesh , rather than the term guf . He explains that while engaging in the process of guarding the physical health, one may not thereby trample on his spiritual health.

"'To love' means to feel one's being only through and in the being of another. 'To love God' therefore, means to feel that one's own existence and activity are rendered possible and obtain value and significance only through God and in God. You exist and are something only through God; and therefore in all that you are and do, you have only to strive to reach God -- that is, to perform His will." R' Samson Raphael Hirsch, Horeb, 9.

"Thy commandments are the end which I love; all other things have value to me only to the extent that they serve as means to the attainment of this end." Rav Hirsch on Tehillim 119:44-48

"Thy commandments are the end which I love; all other things have value to me only to the extent that they serve as means to the attainment of this end." Rav Hirsch on Tehillim 119:44-48

"The approach of R. Samson Raphael Hirsch enables us to educate and produce God-fearing and Torah loyal young men, and righteous and valiant young women. Indeed, this is the “ Frankfurt ” approach, also known as the “Torah and Derekh Eretz approach.” It is a tried and tested method. It is especially appropriate in this country, at this time, which has much in common with the Haskalah period in Germany during the previous century." R' Shimon Schwab

"The definition of a gadol be'Yisrael is one who is great in Torah and great in piety, one whose personal views and conduct are based exclusively on those twin pillars. Such a person is acknowledged as a peer by the other great men of his era. Rabbi Samson Raphael Hirsch was revered by the Chassidic leaders of Galicia and by the rabbis of Lithuania. That his views did not accord with theirs was immaterial; his philosophy grew out of his G-d-fearing understanding of Torah, and therefore it was legitimate for him. So it was with Rabbi Salomon Breuer and so it was with Rabbi Joseph Breuer. Their greatness transcended community. They belonged to Klal Yisrael, so they were honored by Klal Yisrael, all of it."

"...in Germany where there was so much assimilation, a number of German Jews decided they are going to fight for the preservation of the Torah. And they built up an Orthodox kehilla that was excellent in every detail. They were machmir in everything. In some respects, they were more frum than the Jews in Russia and Poland were. And they had organized kashrus. Strict hashgacha. Not rabbanim who gave heksherim and were paid for it. No. The kehillias gave hashgacha and were very strict in every detail. And so the minority that withstood the test were a glorious fulfillment of the prophecy that the Am Yisroel will continue forever despite any circumstances."

R' Miller on Great Kehillas