Based on Mishnah Torah I: Book of Knowledge, the Laws of Foundations of Torah, Ch. 2, Halacha 1

What are the two fundamental forces of every relationship?

Love

and

Fear.

What are they exactly?

Here are the Rambam's words:

What is the path [to attain] love and fear of Him? When a person contemplates His wondrous and great deeds and creations and appreciates His infinite wisdom that surpasses all comparison, he will immediately love, praise, and glorify [Him], yearning with tremendous desire to know [God's] great name, as David stated: "My soul thirsts for the Master of All the Forces of Universe, for the living God" [Psalms 42:3].

When he [continues] to reflect on these same matters, he will immediately recoil in awe and fear, appreciating how he is a tiny, lowly, and dark creature, standing with his flimsy, limited, wisdom before He who is of perfect knowledge, as David stated: "When I see Your heavens, the work of Your fingers... [I wonder] what is man that You should recall Him" [Psalms 8:4-5].

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