Yet it belongs to the very essence of electing love to recognize that it is not inherently necessary to that love which God necessarily and enternally is that he should set such love as issues in redemption and adoption upon utterly undesirable and hell-deserving objects.
It was of the free and sovereign good pleasure of his will, a good pleasure that emanated from the depths of his own goodness, that he chose a people to be heirs of God and joint-heirs with Christ. The reason resides wholly in himself and proceedes from determinations that are peculiarly his as the "I am that I am." The atonement does not win or constrain the love of God.
The love of God constrains to the atonement as the means of accomplishing love's determinate purpose."
~John Murray, "Redemption, Accomplished and Applied"