וַיֵּ֣לֶךְ הָאִ֔ישׁ אֶ֖רֶץ הַחִתִּ֑ים וַיִּ֣בֶן עִ֗יר וַיִּקְרָ֤א שְׁמָהּ֙ ל֔וּז ה֣וּא שְׁמָ֔הּ עַ֖ד הַיּ֥וֹם הַזֶּֽה׃ (פ)
그 사람이 헷 사람의 땅에 가서 성읍을 건축하고 그 이름을 루스라 하였더니 오늘날까지 그곳의 이름이더라
Akeidat Yitzchak
That concept was taught to Jacob in the dream via the vision of the ladder. Another way of expressing the lesson is this: Only after mastery of the lessons of ma-aseh bereshit, the workings of the physical universe, can one hope to gain insights into ma-asseh merkavah, the workings of celestial relationships.