"The love of God is seen in its fullness only at the cross of Jesus Christ. The intimations of God's love in creation and providence are somewhat ambiguous. There are earthquakes as well as beautiful sunsets, cancer and other forms of sickness as well as health. Only at the cross does God show his love fully and without ambiguity.
For that reason it is difficult to find a verse in the New Testament that speaks about God's love without also speaking in the same verse or in the immediate context about God's gift of his Son on Calvary."
p332, Foundations of the Christian Faith by James Montgomery Boice. IVP 1986