"Were a person who had committed an awful crime to be suddenly arrested; were his guilt brought home to his conscience by some messenger of justice, in the pointed language of Holy Writ, 'Thou art the man;' it would be perfectly natural for the culprit to turn pale, to falter in his speech, to tremble, and to present every symptom of real agony and distress. When Belshazzar, the proud Assyrian monarch, saw the appearance of a man's hand writing upon the plaster of the wall of his palace, his countenance was changed, and his thoughts troubled him, so that the joints of his loins were loosed and his knees smote one against another. And the effects have never yet been deemed unnatural. Why then should it be thought strange to behold sinners who have been powerfully awakened by the Spirit of God, who are so deeply convinced of the enormity of their crimes as to apprehend they are every moment in danger of dropping into the burning lake, who imagine that hell is moved from beneath to meet them at their coming, why should it be thought unnatural for such persons to discover outward symptoms of the alarming distress and agitation felt within?'' -- Memoir of Wm. Bramwell"
About the middle of the sermon a man cried out. I fell to prayer, nor could we preach any more for cries and tears all over the chapel." - Thos. Collins.
Oswald J. Smith, The Revival We Need, pp. 51-52
A revival always includes conviction of sin
"A revival always includes conviction of sin on the part of the church. Back-slidden professors cannot wake up and begin right away in the service of God without deep searchings of heart. The fountains of sin need to be broken up. In a true Revival, Christians are always brought under such conviction; they see their sins in such a light that often they find it impossible to maintain a hope of their acceptance with God. It does not always go to that extent, but there are always, in a genuine Revival, deep convictions of sin, and often cases of abandoning all hope." - Chas. G. Finney.
Oswald J. Smith, The Revival We Need, pp. 58-59
Another gospel - with no conviction
There is another Gospel, too popular in the present day, which seems to exclude conviction of sin and repentance from the scheme of Salvation; which demands from the sinner a mere intellectual assent to the fact of his guilt and sinfulness, and a like intellectual assent to the fact and sufficiency of Christ's atonement; and such assent yielded, tells him to go in peace, and to he happy in the assurance that the Lord Jesus has made all right between his soul and God; thus crying peace, peace, when there is no peace.
"Flimsy and false conversions of this sort may be one reason why so many who assume the Christian profession dishonor God and bring reproach on the church by their inconsistent lives, and by their ultimate relapse into worldliness and sin. The whole counsel of God must be declared. 'By the law is the knowledge of sin.' Sin must be felt before it can be mourned. Sinners must sorrow before they can be comforted. True conversions are the great want of the times. Conversions such as were common once, and shall be again, when the church shakes off her lethargy, takes hold upon God's strength, and brings down the ancient power. Then, as of old, sinners will quail before the terror of the Lord." - J. H. Lord.
Oswald J. Smith, The Revival We Need, p49