"The world is not yesterday or tomorrow, but only now. Every person has the capacity to find within the reason why s/he was born and the reason of life."
http://www.rediff.com/news/special/the-scotsman-who-loves-india/20170914.htm
Why can't we say "a reason of life" in the given context?
why we need definite article?
The speaker said 'the' because he believes there is only one reason of life. More natural English is 'the reason for life'.
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The speaker said 'the' because he believes there is only one reason of life.
More natural English is 'the reason for life'.