“Do every act of your life as though it were the very last act of your life.”
Source: Meditations
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes
“Touch me again, and it will be your last act in life - Blue Eyes.”
Source: Jealousy

“Live and act within the limit of your knowledge and keep expanding it to the limit of your life.”
Source: Atlas Shrugged

“Every moment in life is an act of faith”
Variant: Life is an act of faith.
Source: Brida

“Change your life today. Don't gamble on the future, act now, without delay.”
Attributed
Source: As quoted in The Book of Positive Quotations (2007) by John Cook, p. 548

Other

“Don't live your life as though you were measuring it with a ruler.”
The Way of God's Will Chapter 2-2 Character http://www.unification.org/ucbooks/WofGW/wogw2-02.htm Translated 1980.