All believers must "try the spirits" because false prophets and false teachers deprive us of liberty. Some people claim to know the Spirit's inward enlightenment, but the darkness of Satan fills their imaginations. This false light is of no use to the souls of men; it is in opposition to Christ and his work. The only way to tackle this is by giving a plain and scriptural account of the nature and work of the Holy Spirit. His work did not end at Pentecost, otherwise all faith in Christ would have ceased, and Christianity also. The Spirit continues to work in the hearts of men, convicting of sin; producing godly sorrow and humility; regenerating and sanctifying; supplying grace and helping in prayer. This is a very lightly edited text with a new layout and is fully subtitled which makes it more accessible to a new generation of readers.