“…as often as we hear that Christ is armed with eternal power, let us learn that the perpetuity of the Church is thus effectually secured; that amid the turbulent agitations by which it is constantly harassed, and the grievous and fearful commotions which threaten innumerable disasters, it still remains safe. Thus, when David derides the audacity of the enemy who attempt to throw off the yoke of God and his anointed, and says, that kings and nations rage ‘in vain,’ (Ps. 2:2–4), because he who sitteth in the heaven is strong enough to repel their assaults, assuring believers of the perpetual preservation of the Church, he animates them to have good hope whenever it is occasionally oppressed. So, in another place, when speaking in the person of God, he says, ‘The Lord said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool,’ (Ps. 110:1), he reminds us, that however numerous and powerful the enemies who conspire to assault the Church, they are not possessed of strength sufficient to prevail against the immortal decree by which he appointed his Son eternal King. Whence it follows that the devil, with the whole power of the world, can never possibly destroy the Church, which is founded on the eternal throne of Christ. Then in regard to the special use to be made by each believer, this same eternity ought to elevate us to the hope of a blessed immortality. For we see that every thing which is earthly, and of the world, is temporary, and soon fades away. Christ, therefore, to raise our hope to the heavens, declares that his kingdom is not of this world (John 18:36). In fine, let each of us, when he hears that the kingdom of Christ is spiritual, be roused by the thought to entertain the hope of a better life, and to expect that as it is now protected by the hand of Christ, so it will be fully realised in a future life.”
– John Calvin (1509-1564), Institutes of the Christian Religion, II.xv.3.