NOTES for Deu 11:26-28
The most important word here is "today." We live neither in yesterday nor in tomorrow, and precisely today we are given the opportunity to make the most important decision in our life. Because behind each of our choices, even the smallest, stands our decision about what in general guides us in life. And here there are only two options: to obey the Lord's commandments, though now we are not speaking about how we fulfill them, or not to obey; to seek His ways or some other ways. Then every step of ours either brings us closer to God or moves us away from Him, leads us into eternal life or into death.
The words of Moses are addressed to the people, and therefore to each person individually and to all together. Accordingly, blessing and curse are both our personal choice and the choice of all humanity.