Luther on Apologetics and God's Love

Rather than ask why God permits men to be hardened and fall into everlasting perdition, ask why God did not spare his only Son, but gave him for us all, to die the ignominious death of the cross, a more certain sign of His love towards us poor people than of his wrath against us. Such questions cannot be better solved and answered than by converse questions...

It seems best not to inquire why God sometimes, our of his divine counsels, wonderfully wise and unsearchable to human reason and understanding, has mercy on this man. We should know without doubt that he does nothing without certain cause and counsel. Truly, if God were to give an account to every one of his works and actions, he would be but a poor, simple God.

Martin Luther, Table Talk