It means live in the moment. You can't change the past, so don't worry about it. The future does depend on what you're doing now, but belive it is good.
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A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
One of the most prominent characteristic of Monna Giovanna is that, she is co<span>nsidered to be one of the most beautiful and charming woman there ever was in Florence. He was suited by Federigo Alberighi. Hope this answers your question. </span>