What is the proof of eternal life?
The proof of eternal life is the indwelling Holy Spirit. When a person has genuinely experienced salvation, the Spirit of God dwells within them, and this indwelling Spirit is the evidence that they possess eternal life. This confirms their position in Christ.
Les explains that the condition is whether the Spirit of God dwells in you. If you have genuinely experienced salvation, the Spirit of God dwells in you, and that indwelling Holy Spirit is the proof that you have eternal life. He calls this 'the proof of the pudding.' The surrounding context notes that believers are not in the flesh but in the Spirit, in Christ; their position has changed, and they are now a child of God. The indwelling Holy Spirit serves as the evidence of that eternal life.