Life is wasted if we do not grasp the glory of the cross, cherish it for the treasure that it is, and cleave to it as the highest price of every pleasure and the deepest comfort in every pain. What was once foolishness to us—a crucified God—must become our wisdom and our power and our only boast in this world.
John PiperProsperity cannot be a proof of God's favor, since it is what the devil promises to those who worship him. (Matt. 4:9)
John PiperThe suffering of sickness and the suffering of persecution have this in common: they are both intended by Satan for the destruction of our faith, and governed by God for the purifying of our faith... Christ sovereignly accomplishes His loving, purifying purpose, by overruling Satan's destructive attempts. Satan is always aiming to destroy our faith; but Christ magnifies His power in weakness.
John PiperNot to abide in Jesus’ love would mean that we stop believing that we are loved by Jesus. We look at our circumstances - perhaps persecution or disease or abandonment - and we conclude that we are not loved by Jesus anymore. That’s the opposite of abiding in the love of Jesus. So abiding in his love means continuing to believe, moment by moment, that we are loved.
John Piper