This is the point of the gospel test - once you've actually taken that commitment and taken that leap of faith, you can feel it... but it is so different from anything that you could be convinced of otherwise. It's just something you have to discover for yourself. Either way, I don't like tomk's argument about attributing circumstances to God. Of course we are commanded to glory God, but I don't see why it is wrong to attribute wonderful things to what science has informed us they actually are. For instance we could look at a lightbulb and thank God for giving us a magic source of light, or we could know that the light comes from the diffusion of electric energy... and thank God for it. It's also difficult for some people. I don't know what makes the difference, whether it's level of dedication or what, but many people try and don't get the proof they're looking for, but others do. I don't really know what makes up the difference, but I've felt the difference in my life, and it was frustrating before I got a more concrete answer.