John Calvin, Institutes of the Christian Religion, III.12.8
For many sinners, intoxicated with the pleasures of vice, think not of the judgment of God. Lying stupefied, as it were, by a kind of lethargy, they aspire not to the offered mercy. It is not less necessary to shake off torpor of this description than every kind of confidence in ourselves, in order that we may haste to Christ unencumbered, and while hungry and empty be filled with his blessings. Never shall we have sufficient confidence in him unless utterly distrustful of ourselves; never shall we take courage in him until we first despond of ourselves; never shall we have full consolation in him until we cease to have any in ourselves. When we have entirely discarded all self-confidence, and trust solely in the certainty of his goodness, we are fit to apprehend and obtain the grace of God. …let us lay down this short but sure and general rule, That he is prepared to reap the fruits of the divine mercy who has thoroughly emptied himself, I say not of righteousness, (he has none,) but of a vain and blustering show of righteousness; for to whatever extent any man rests in himself, to the same extent he impedes the beneficence of God.