(טו) רְאֵ֨ה נָתַ֤תִּי לְפָנֶ֙יךָ֙ הַיּ֔וֹם אֶת־הַֽחַיִּ֖ים וְאֶת־הַטּ֑וֹב וְאֶת־הַמָּ֖וֶת וְאֶת־הָרָֽע׃ (טז) אֲשֶׁ֨ר אָנֹכִ֣י מְצַוְּךָ֮ הַיּוֹם֒ לְאַהֲבָ֞ה אֶת־יְהוָ֤ה אֱלֹהֶ֙יךָ֙ לָלֶ֣כֶת בִּדְרָכָ֔יו וְלִשְׁמֹ֛ר מִצְוֺתָ֥יו וְחֻקֹּתָ֖יו וּמִשְׁפָּטָ֑יו וְחָיִ֣יתָ וְרָבִ֔יתָ וּבֵֽרַכְךָ֙ יְהוָ֣ה אֱלֹהֶ֔יךָ בָּאָ֕רֶץ אֲשֶׁר־אַתָּ֥ה בָא־שָׁ֖מָּה לְרִשְׁתָּֽהּ׃ (יז) וְאִם־יִפְנֶ֥ה לְבָבְךָ֖ וְלֹ֣א תִשְׁמָ֑ע וְנִדַּחְתָּ֗ וְהִֽשְׁתַּחֲוִ֛יתָ לֵאלֹהִ֥ים אֲחֵרִ֖ים וַעֲבַדְתָּֽם׃ (יח) הִגַּ֤דְתִּי לָכֶם֙ הַיּ֔וֹם כִּ֥י אָבֹ֖ד תֹּאבֵד֑וּן לֹא־תַאֲרִיכֻ֤ן יָמִים֙ עַל־הָ֣אֲדָמָ֔ה אֲשֶׁ֨ר אַתָּ֤ה עֹבֵר֙ אֶת־הַיַּרְדֵּ֔ן לָבֹ֥א שָׁ֖מָּה לְרִשְׁתָּֽהּ׃ (יט) הַעִידֹ֨תִי בָכֶ֣ם הַיּוֹם֮ אֶת־הַשָּׁמַ֣יִם וְאֶת־הָאָרֶץ֒ הַחַיִּ֤ים וְהַמָּ֙וֶת֙ נָתַ֣תִּי לְפָנֶ֔יךָ הַבְּרָכָ֖ה וְהַקְּלָלָ֑ה וּבָֽחַרְתָּ֙ בַּֽחַיִּ֔ים לְמַ֥עַן תִּחְיֶ֖ה אַתָּ֥ה וְזַרְעֶֽךָ׃ (כ) לְאַֽהֲבָה֙ אֶת־יְהוָ֣ה אֱלֹהֶ֔יךָ לִשְׁמֹ֥עַ בְּקֹל֖וֹ וּלְדָבְקָה־ב֑וֹ כִּ֣י ה֤וּא חַיֶּ֙יךָ֙ וְאֹ֣רֶךְ יָמֶ֔יךָ לָשֶׁ֣בֶת עַל־הָאֲדָמָ֗ה אֲשֶׁר֩ נִשְׁבַּ֨ע יְהוָ֧ה לַאֲבֹתֶ֛יךָ לְאַבְרָהָ֛ם לְיִצְחָ֥ק וּֽלְיַעֲקֹ֖ב לָתֵ֥ת לָהֶֽם׃
(15) See, I set before you this day life and prosperity, death and adversity. (16) For I command you this day, to love the LORD your God, to walk in His ways, and to keep His commandments, His laws, and His rules, that you may thrive and increase, and that the LORD your God may bless you in the land that you are about to enter and possess. (17) But if your heart turns away and you give no heed, and are lured into the worship and service of other gods, (18) I declare to you this day that you shall certainly perish; you shall not long endure on the soil that you are crossing the Jordan to enter and possess. (19) I call heaven and earth to witness against you this day: I have put before you life and death, blessing and curse. Choose life—if you and your offspring would live— (20) by loving the LORD your God, heeding His commands, and holding fast to Him. For thereby you shall have life and shall long endure upon the soil that the LORD swore to your ancestors, Abraham, Isaac, and Jacob, to give to them.
life and death. They are the blessing and the curse, and here, you have the ability to choose life.
That you may live. In body or in memory. And the perush, explanation, is that [the purpose of] life is to love.
(יט) הַעִידֹ֨תִי בָכֶ֣ם הַיּוֹם֮ אֶת־הַשָּׁמַ֣יִם וְאֶת־הָאָרֶץ֒ הַחַיִּ֤ים וְהַמָּ֙וֶת֙ נָתַ֣תִּי לְפָנֶ֔יךָ הַבְּרָכָ֖ה וְהַקְּלָלָ֑ה וּבָֽחַרְתָּ֙ בַּֽחַיִּ֔ים לְמַ֥עַן תִּחְיֶ֖ה אַתָּ֥ה וְזַרְעֶֽךָ׃(כ) לְאַֽהֲבָה֙ אֶת־יְהוָ֣ה אֱלֹהֶ֔יךָ לִשְׁמֹ֥עַ בְּקֹל֖וֹ וּלְדָבְקָה־ב֑וֹ כִּ֣י ה֤וּא חַיֶּ֙יךָ֙ וְאֹ֣רֶךְ יָמֶ֔יךָ לָשֶׁ֣בֶת עַל־הָאֲדָמָ֗ה אֲשֶׁר֩ נִשְׁבַּ֨ע יְהוָ֧ה לַאֲבֹתֶ֛יךָ לְאַבְרָהָ֛ם לְיִצְחָ֥ק וּֽלְיַעֲקֹ֖ב לָתֵ֥ת לָהֶֽם׃
(19) I call the skies and the earth to witness regarding you today: I've put life and death in front of you, blessing and curse. And you shall choose life, so you'll live,you and your seed, (20) to love the YHWH, your God, to listen to His voice and to cling to Him, because He is your life and the extension of your days to reside on the land that the YHWH swore to your fathers, to Abraham, to Isaac, and to Jacob, to give them.
Richard Elliott Friedman, Commentary on the Torah, p. 660
30:19. choose life. The theme of the path to life began early in Moses' speech (Deut. 4:1) and culminates here in the last words of the speech. This focus at the conclusion of the Torah returns us to the Torah's opening: the loss of the tree of life. Humans lose access to the tree of life as the price of having gained access to the tree of knowledge of good and bad. Now the people are told, "I've put in front of you life and good, blessing and curse." Using the knowledge of good and bad, and choosing to do good is the path back to life—not necessarily eternal life (though who knows?), but meaningful life, fulfilling life. As the book of Proverbs says about knowledge and wisdom: "It is a tree of life." And Jews sing this verse from Proverbs each Sabbath after reading the Torah and returning it to the ark.
30:20. He is your life. This can also be understood to mean "It is your life." Translators are split on this. The former means that Moses is saying that God is the people's life and the source of their being in the land a long time. The latter means that the people's choice to love, listen, and cling to God is their life and the source of lengthy time in the land. That is, the question of whether it is God or it is the people's feeling about God that brings this about. I do not know which is correct.