This word knowledge means full, experiential knowledge. To love in God's economy is to love beyond emotion and feeling. There is something at the foundation of this love. This is not saccharin, imitation love. This is not authentic love.
Authentic love loves on the basis of substance or content.
Love has nothing to fear from light. Intense love makes people sensitive to slights and misunderstandings unless they apply full knowledge. This word denotes fineness of perception. Knowledge is important for any specialist in any field. I do not want my plummer to perform surgery on me.