
Better:
"Without a doubt, he will succeed."
or
"He will succeed, without a doubt."

Is the comma really necessary?

The comma helps avoid the misreading "He will succeed-without-a-doubt" (that is, he will succeed without his having any doubts). The reader would eventually figure out what was meant without the comma, but if it costs the writer nothing to insert it, it's better to do it.

Thanks for the concise explanation.
I never saw that there might be another interpretation.
Fixed.
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This sentence was initially added as a translation of sentence #289665
added by VirtuOZ, July 5, 2013
linked by VirtuOZ, July 5, 2013
edited by VirtuOZ, July 10, 2013
linked by soridsolid, September 30, 2021
linked by marafon, February 13, 2023
linked by marafon, February 13, 2023