life

Life is like a box of chocolates, you never know what you're gonna get.
(also: chocolate)

Life is what happens to you while you're busy making other plans

Life...is like a grapefruit. It's orange and squishy and has a few pips in it, and some folks have half a one for breakfast

(n.) a force. the water we swim through, in every conscious and unconscious moment, and take woefully for granted.

(also: death)
(also: this is water)

(n.) the eternal cycle of violence and poor career decisions which keeps us all occupied until death

Life is a meaningless cycle of suffering and pain,that everyone need to go through and try to get the best out of it.

n. A spiritual pickle preserving the body from decay. We live in daily apprehension of its loss; yet when lost it is not missed. The question, "Is life worth living?" has been much discussed; particularly by those who think it is not, many of whom have written at great length in support of their view and by careful observance of the laws of health enjoyed for long terms of years the honors of successful controversy.

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"Life's not worth living, and that's the truth,"
Carelessly caroled the golden youth.
In manhood still he maintained that view
And held it more strongly the older he grew.
When kicked by a jackass at eighty-three,
"Go fetch me a surgeon at once!" cried he.
—Han Soper

(also: The Devil's Dictionary)

when something is born it will die after its life
meaning we are all born to die

the period of time between your birth and your death.

time with the only goal to make yourself/others happy.
some people have hard time keeping these two groups in ballance.