Whom having not seen, you love; in whom, though now you see him not, yet believing, you rejoice with joy unspeakable and full of glory:
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Irenaeus of Lyons
AD 202
And Peter says in his Epistle: "Whom, not seeing, ye love; in whom, though now ye see Him not, ye have believed, ye shall rejoice with joy unspeakable; ".
And this it is which has been said also by Peter: "Whom having not seen, ye love; in whom now also, not seeing, ye believe; and believing, ye shall rejoice with joy unspeakable."