God's love is exalted. Psalm 103:
11 For as high as the heavens are above the earth, so great is his love for those who fear him.
Ephesians 3:
17 so that Christ may dwell in your hearts through faith—that you, being rooted and grounded in love, 18 may have strength to comprehend with all the saints what is the breadth and length
Mathematically, breadth and length run along two independent axes.
Height and depth run along the same axis of dimension. Height went up from the plane generated by breadth and length. Depth went down. The love of Christ dwells deeply in our hearts (v 17); also, his love is exalted high above the earth.
19 and to know the love of Christ that surpasses knowledge, that you may be filled with all the fullness of God.
The breadth, length, height, and depth is a poetic way of describing the all-encompassing nature of Christ's love. It reaches every possible dimension of human existence and beyond, emphasizing its limitless and transformative power in the lives of believers.
Height and depth emphasized on the vertical dimension of love. Romans 8:
39 neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.
Jesus' love reaches the lowest depth to raise us high, e.g., from depression to joy.