What are the implicacations of the the first half of the Pasuk "be'CHol ha'Derech asher Tzivah Hashem ... Teilechu"?
Oznayim la'Torah: Following the Mitzvos, Chukim and Mishpatim - in Pasuk 28, the Torah is now referring to emulate the Midos of Hashem - We find elsewhere that Ge,ilus Chasadim and Bikur Cholim are referred to as "'Derech' and ''Yeilchu'. And the Torah concludes "Beraisa that we cite every morning 'Eilu Devarim she'Adam Ochel Peiroseihem ba'Olam ha'Ba, ve'ha'Keren Kayemes lo la'Olam ha'Ba'. 1
What are the implications of "Lema'an Tichyun, ve'Tov lachem Veha'arachtem Yamim ... "?
Ramban: It implies 'So that you shall live all the days that are allotted to you, receive all the B'rachos that are listed in Bechukosai and elsewhere and that you will pass on the land to your descendents forever'.
Seforno: "Lema'an Tichyun" implies a long and successful life in this world; "ve'Tov lachem", reward in the world which is everlasting, whereas "Veha'arachtem Yamim ... " implies that you will acquire this whilst living in the land in safety and without troubles.