"The wind blows where it wishes, and you hear the sound of it, but cannot tell where it comes from and where it goes. So is everyone who is born of the Spirit.” John 3:8
I remember talking to a co-worker at one point about believing in God - someone we cannot see - and so I compared it to wind in that we believe there is wind because we can feel it, we can see the effects of it yet we can't physically see wind either! There is a passage about it found in John 3:1-10... and for further reference (though I didn't 100% check out the doctrine to make sure it's Evangelical) is found here.
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