What, in your opinion, is the single most important thing in life?

Peace of mind.

I find that a trick question, really. Like which wheel is the most important on a car? You need several things in life, any one of which can kill you if it's missing or devastate your quality of life - which brick is most important in a wall? Which grain of sand is most important on a beach?

It's a recipe - and you need certain key ingredients, and then you usually have some of the thousands more. Which wing is more important on an airplane? Like that.

To enjoy life requires a cooperation between the physical characteristics/attributes of the body/mind, with the intellect.

I maybe able to do advanced math; however, if my mind doesn't enjoy doing it, then there is no joy, no passion there in that activity. I might come up with great advances, but if I don't enjoy doing it, I am suffering, or rather, there is suffering.

If the body is enjoying itself, but the intellect is bored, it will be unengaged with the activity and such a person is divided also.

Both elements must operate as one in order for life. What is there when the intellect is disengaged or when the body is suffering the impositions of the intellect without joy? Death: frustration, seeking, trying to escape.

Love

Happiness.

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life

Conciousness of the mind

Having a reason to live.

breathing. Try doing without for ten minutes and report back.