Jacob's blessing in Genesis 26: No fear, God's presence and blessing, and countless descendants.

Jacob's blessing in Genesis 27: Wealth, world leadership, and the Covenant of Abraham.

These blessings can be inherited by Jacob's descendants today. The covenant, including many descendants, is unconditional. Israel doesn't need to do anything at all to keep it. The rest, however, is closely tied to continued obedience. So long as Israel keeps the commandments and keeps faith in YHWH, they will prosper. Disobey, and they are defeated and exiled.
#toldot