A Crucial Key to Evangelism: Do Not Grieve the Holy Spirit

An excellent quote from the book we're studying in Sunday school at Kosmosdale Baptist Church-- The Brokenhearted Evangelist-- about not grieving the Spirit (Eph 4:30) in other areas of our lives while seeking to be faithful in evangelism. 

[I]f no conversion takes place outside or beyond the work of God's Holy Spirit, then it is utterly indispensable that we do not grieve the very One upon whom the joy of our salvation and the consistent life of godliness depend, when those things are the very foundation upon which our testimony to fallen people is built.