Be filled with the Spirit - This is not a promise

On many websites I find variations on a quote by C. H. Spurgeon. He is commenting on “Be filled with the Spirit” from Ephesians. I first encountered this quote in *The Way of Holiness* by Stephen F. Olford, in “The Signpost of Spirit-fullness”. > “This is not a promise; it is a command to obey.” None of the places I have looked cite the sermon or other publication where he said this. This includes using Gemini, Copilot and a focused Google search of Spurgeon.org. On what occasion did he say this? What is the fuller context?