What is the gospel? Well, you remember the answer of the Apostle Paul, 'It is the power of God unto salvation to every one that believeth' (Rom. 1.16).--Martyn Lloyd-Jones, Revival (Crossway, 1987), 123
How easy it is to forget that. How easy to preach it as a system, to preach it as a collection of ideas, or just to preach it as a truth. Ah, but you can do that without power. There are people, say the Apostle Paul, who 'have a form of godliness, but deny the power thereof' (2 Tim. 3.5).
Christianity is primarily a life. It is a power. It is a manifestation of energy.