A revival is a time of quickening or impartation of life. As God alone can give life, a revival is a time when when God visits His people and by the power of His Spirit imparts new life to them, and through them imparts life to sinners dead in trespasses and sins. We have religious excitements gotten up by the cunning methods and hypnotic influence of the mere professional evangelist; but these are not revivals and are not needed. They are the devil’s imitations of a revival. New life from God–that is a revival. A general revival is a time when this new life from God is not confined to scattered localities, but is general throughout Christendom and the earth.

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…revivals also have a decided influence on the unsaved world.

First of all, they bring deep conviction of sin. Jesus said that when the Spirit was come He would convince the world of sin (John 16:7-8). Now we have seen that a revival is a coming of the Holy Spirit, and therefore there must be new conviction of sin, and there always is. If you see something men call a revival, and there is no conviction of sin, you may know at once that it is bogus. It is a sure mark.

–R.A. Torrey, How To Pray

Marks of Revival - J. I. Packer
Revival-and Renewal - A.W. Tozer
Revival Conditions - A.W. Tozer
What Is a Revival? by C. H. Spurgeon

The Spirit of Revival (pt. 1) - R.C. Sproul
The Spirit of Revival (pt. 2)
The Spirit of Revival (pt. 3)
The Spirit of Revival (pt. 4)
The Spirit of Revival (pt. 5)

Test Revival with Doctrine - John Piper

MARJOE GORTNER-HOW FALSE PROPHET WORKS - YouTube

Psalm 19:7a HCSB
The instruction of the Lord is perfect,
reviving the soul;