Trascendence and Reason.

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But you've had 'transcendental' moments, how do you make 'sense' of them.

I'm sure you dont just think 'rationally' all the time so how do you deal with these experiences?

Transcendental moments are the brain's way of saying: Stop. Pay attention.  Something important is happening here.  Neurotransmitters flood certain areas of the brain depending on the nature of the transcendence and essentially cause the whole brain to focus on the experience.  Some are purely a reward for being alive.  Rainbows and halos are one trigger for me.  They are my brain's way of telling me that I am the focus of all the beauty and wonder in the world.  Rational thought is not excluded, indeed one of the purposes of transcendent experiences is to explore why the brain is calling my attention to the experience.  At the very least rain and sun are necessary for life, and although rain may be an annoyance when it stops and the sun comes out I am rewarded by the brain for being outside in the unpleasant but necessary rain, and enjoying "My moment in the sun."   

The experience is far, far older than modern man, and indeed should be unremarkable for one whose only worry is that the car won’t skid on the wet road, but the brain remembers our ancestors who were out planting, weeding and otherwise getting sustenance for the family in the “bad” weather.   

Religion tries and generally succeeds in capturing transcendence and slaving it to the service of God, e.g. a rainbow is God's promise that Hesh won't kill all "that has the breath of life" ever again, with the not so veiled threat that Hesh could if Hesh wanted to.