How did the unity of “one person with one heart” emerge specifically before the giving of the Torah?

This source-based Hagut Yosef essay explores the question: How did the unity of “one person with one heart” emerge specifically before the giving of the Torah? The canonical Hebrew article develops the theme through Torah sources and reflection on human life. This localized discovery layer preserves the source’s meaning and identity and does not add new halakhic, historical, psychological, medical, legal, political, scientific, or empirical claims beyond the Hebrew source.