Christian baptism in the name of Jesus Christ lacks power and purpose if there is no resurrection, for baptism signifies a new life and hope in Jesus that extends beyond this life.
Paul faced many dangers, enemies and sufferings to preach the gospel and live for Christ. That would be foolish if there is no resurrection and heaven. Paul admits we might as well just pursue fun, comfort and entertainment as much as we can, if tomorrow we die and that's all (Isa 22:13).
Paul quotes a Greek poet, whom the Corinthians would be familiar with: "Bad company corrupts good character." Bad company rejects the resurrection and lives for here and now. Paul urges them to wake up, come back to their senses, and repent of such ignorant, shameful living. Rather, they should know and live according to God's truth and power.
Application: Father, may I not live like a fool, chasing the things of this world. May I rather live today with true knowledge of God and with living hope in Jesus Christ my Lord and Savior.
One Word: Don't be foolish, but wise; live with faith in Jesus' resurrection