If God were not just, there would be no demand for his Son to suffer and die. And if God were not loving, there would be no willingness for his Son to suffer and die. But God is both just and loving. Therefore his love is willing to meet the demands of his justice.
John PiperWe do not choose suffering simply because we are told to, but because the one who tells us to describes it as the path to everlasting joy.
John Piper