וְאַ֨בְרָהָ֔ם הָי֧וֹ יִֽהְיֶ֛ה לְג֥וֹי גָּד֖וֹל וְעָצ֑וּם וְנִ֨בְרְכוּ ב֔וֹ כֹּ֖ל גּוֹיֵ֥י הָאָֽרֶץ׃
seeing that Abraham shall surely become a great and mighty nation, and all the nations of the earth shall be blessed in him?
Read kabbalistic (mystical) interpretation of Genesis 18:18: and classical mystical sources.