English: “Blessing and curse” — blessing, that you hearken; curse, that you do not hearken.
On the daf / in context: Sifrei reads the blessing and the curse as the direct consequence of listening or refusing to listen, not as external rewards detached from the act itself.
Type of Learning
Derash on the structure of the verse (Sifrei) — the blessing is defined as the hearkening itself.
What Is Learned
The blessing is not merely a later reward; hearkening to the commandments is itself the blessing.