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Is it correct to use commas around therefore in the following quote?
An important prerequisite to meet the requirements of ... is, therefore, the ability to ...
Or should I omit the first comma to make the sentence correct?
An important prerequisite to meet the requirements of ... is therefore, the ability to ...
You can either not use commas at all
is therefore the ability to...
Or use commas before and after:
is, therefore, the ability to...
The commas are parenthetical, which can often be omitted when the interruption is brief, as in this example, but you should never use a comma before a parenthetical phrase and not after it (or vice versa).
See the section on parenthetical commas here to learn more.
