Peter Master's is the pastor of the Metropolitan Tabernacle where Spurgeon preached. He has been preaching there since 1970 (he's old). I often find it helpful to listen to those from England preach. They think differently than we do.

"The chief message of this personal letter to a Christian lady is the duty and protective power of mutual love against error. Here we define ‘walking in the truth’, consider how fellowship love guards against doctrinal and spiritual collapse, and summarise the main heresies over time."

Preached on October 13, 2019 - https://metropolitantabernacle.org/sermons-online/guarding-the-truth/