How Can We Pray in the Holy Spirit- Does That Mean Praying in Tongues? + Do Not Slander Satan, Demons or Angels + Charles Spurgeon's Advice To Preachers on the Holy Spirit. Reading Jude #332

Jude is a fascinating, but short book of the Bible. In it, the author warns us against slandering an sort of heavenly being, including Satan himself. We aren't supposed to talk bad about the devil? Also: How can we practically pray in the Spirit - is praying in the Spirit the same thing as praying in tongues?