The 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 PiperOur deeds are not the basis of our salvation, they are the evidence of our salvation. They are not foundation, they are demonstration.
John PiperThe main reason God has given us minds is that we might seek out and find all the reasons that exist for treasuring him in all things and above all things.
John Piper