That's why it took me a very long poem to try to provide an adequate answer earlier this year: https://medium.com/write-under-the-moon/what-is-love-553648694528

One stanza connects to the most elemental form of love, which I feel is the love you discuss here:

"Pure love

Unadulterated by human thoughts

Without emotion

True unconditional love

Acceptance without motive

Selfless

Survives detachment

Without judgment

Agape

Heart energized and centered

Excuse me, while I kiss the sky

Sky: The vault of heaven; Heaven, the dwelling place of God."