Pointing back to μακροθυμία long-suffering, Heb 6:12.
He obtained (ἐπέτυχεν)
The compounded preposition ἐπὶ has the force of upon: to light or hit upon. The verb indicates that Abraham did not personally receive the entire fulfillment of the promise, but only the germ of its fulfillment. It was partially fulfilled in the birth of Isaac. See Rom 4:18.
The security of the divine promise illustrated by the analogy of human practice.