Well if you don't feed your brother in distress (as John says) you can talk all you want but there will be no evidence. But whoso hath this world's good, and seeth his brother have need, and shutteth up his bowels of compassion from him, how dwelleth the love of God in him? My little children, let us not love in word, neither in tongue; but in deed and in truth. (1 John 2:17,18) In modern parlance, John is saying talk is cheap. When you carefully go right down that list, that is OBJECTIVE evidence. Even the inner witness of the Spirit.