Should I use 'is' or 'are' in the sentence below?

All you need in life is/are coffee and good grammar.

This question is different from Agreement in "[Singular Noun] Is/Are [Plural Noun]"? because that question doesn't deal with what verb agreement to use in sentences like this where the subject is "all" (which can be singular, as in "All is well", or plural, as in "All are alike").

marked as duplicate by Dan Bron, tchrist Dec 17 '17 at 18:52

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