Wherein you greatly rejoice, though now for a little while, if need be, you have been put to grief in various trials,

 Peter is drawing an implicit contrast between himself and his readers. It was his great privilege to have known Jesus in the days of his flesh. His readers had not had that joy; but, although they never knew Jesus in the flesh, they love him; and although they do not see him with the bodily eye, they believe. And that belief brings to them a joy beyond speech and clad with glory, for even here and now it makes them certain of the ultimate welfare of their souls. 