Sureness is something like a neck brace which we clamp around our lives hoping to somehow protect ourselves from the frightening constant whiplash of change. Sadly the brace doesn't always hold.
The experience of being in space didn't change my perspective of myself or of the planet or of life. I had no spiritual experience.
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As somebody who in my second marriage insisted on a prenuptial agreement I can also testify that sometimes it is an act of love to chart the exit strategy before you enter the union in order to make sure that not only you but your partner as well knows that there will be no World War III should hearts and minds for any sad reason change.