‏ 1 Corinthians 1:23

But we preach Christ crucified. Not merely Christ, but Christ Crucified; a Crucified Savior.

Unto the Jews a stumblingblock. Because they had an entirely different conception of the Christ. Yet it was predicted that he should be "a stone of stumbling" (Mt 21:42 Isa 8:14)

Unto the Greeks foolishness. It seemed to the Greeks that a being who died so ignominious a death could not be divine.
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