A Life Of Beracha

רְאֵ֗ה אָנֹכִ֛י נֹתֵ֥ן לִפְנֵיכֶ֖ם הַיּ֑וֹם בְּרָכָ֖ה וּקְלָלָֽה אֶֽת⁠־הַבְּרָכָ֑ה אֲשֶׁ֣ר תִּשְׁמְע֗וּ אֶל⁠־מִצְוֺת֙ ה אלקיכם אֲשֶׁ֧ר אָנֹכִ֛י מְצַוֶּ֥ה אֶתְכֶ֖ם הַיּֽוֹם וְהַקְּלָלָ֗ה אִם⁠־לֹ֤א תִשְׁמְעוּ֙ אֶל⁠־מִצְוֺת֙ ה אלקיכם וְסַרְתֶּ֣ם מִן⁠־הַדֶּ֔רֶךְ אֲשֶׁ֧ר אָנֹכִ֛י מְצַוֶּ֥ה אֶתְכֶ֖ם הַיּ֑וֹם לָלֶ֗כֶת אַחֲרֵ֛י אֱלֹהִ֥ים אֲחֵרִ֖ים אֲשֶׁ֥ר לֹֽא⁠־יְדַעְתֶּֽם

Why does it say הַיּ֑וֹם, obviously it was that day?  In the קְּלָלָ֗ה form it says it as a the condition, לֹ֤א תִשְׁמְע, why does it not say that in the beracha form, merely as a fat, אֲשֶׁ֣ר תִּשְׁמְע֗וּ, why the change?  What is the beracha and kellalah, there is nothing mentioned here? 

Rav Hirsch says that the listening is not the condition for the beracha but that is part of the beracha itself.  A life rich of following the mitzvot of Hashem, a life enriched with order, meaning and G-dly service is a life of beracha.  The kellalah is that if one's life strays from the path of Hashem, one's life will be unfulfilled, empty, devoid of meaning. Rav Hirsch relates the word קללה to the word קל, light, no weight, a life without any weight, any depth.  That may be hinted to in the usage of the word הַיּ֑וֹם, the Torah is instructing that these berachot and klallot are not something merely in the future, in the afterlife, but thy will be present and found in one's life.  One who follows Hashem's path is walking in the path of beracha and the opposite for one who is not (see Kedushas Levi.)