I heartily wish that assurance was more sought after than it is. Too many among those who believe begin doubting and go on doubting, live doubting and die doubting, and go to heaven in a kind of mist.
It would ill become me to speak in a slighting way of “hopes” and “trusts.” But I fear many of us sit down content with them, and go no further. I should like to see fewer “peradventurers” [that is, doubters] in the Lord’s family, and more who could say, “I know and am persuaded.” Oh, that all believers would covet the best gifts, and not be content with less! Many miss the full tide of blessedness the Gospel was meant to convey. Many keep themselves in a low and starved condition of soul, while their Lord is saying, “Eat and drink abundantly, O beloved.” “Ask and receive, that your joy may be full.” (Cant. 5:1; John 16:24.)
J.C. Ryle, Holiness, p. 68