18Do not deceive yourselves. If any one of you thinks he is wise by the standards of this age, he should become a "fool" so that he may become wise. 19For the wisdom of this world is foolishness in God's sight. As it is written: "He catches the wise in their craftiness"[a]; 20and again, "The Lord knows that the thoughts of the wise are futile."[b] 21So then, no more boasting about men! All things are yours, 22whether Paul or Apollos or Cephas[c] or the world or life or death or the present or the future—all are yours, 23and you are of Christ, and Christ is of God.