It takes nothing less the VOICE of the Son of God!
If you believe, then it is a certainty that you are ALIVE! Not because of your belief but by the sovereign grace of God!
Life without Christ is darkness. But when Jesus sovereignly “springs up” in the heart of one of God’s children, Light then dwells where there was once utter darkness!
God is all powerful and mighty to save! Our level of faith may fluctuate at times but God's power does not.
Before we are born again, we are only natural creatures operating with natural understanding. We cannot understand spiritual things.