1 Corinthians 1:5

1:5 For you were made rich ¹  in every way in him, in all your speech and in every kind of knowledge ²  –

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¹ sn Made rich refers to how God richly blessed the Corinthians with an abundance of spiritual gifts (cf. v. 7).

² sn Speech and knowledge refer to the spiritual gifts God had blessed them with (as v. 7 confirms). Paul will discuss certain abuses of their gifts in chapters 12-14, but he thanks God for their giftedness.