Gal 6:14 But God forbid that I should boast except in the cross of our Lord Jesus Christ, by whom the world has been crucified to me, and I to the world.
1 Cor 2:2 For I determined not to know anything among you except Jesus Christ and Him crucified.
I can picture Paul and Apollos discussing what to teach the Corinthians.
Apollos : I want to talk about Jesus' return and final judgment because it is based on his finished work on the cross.
Paul : No way, that belongs to the future. You may mention it once and then concentrate on Jesus crucified and nothing else.
Apollos : At least I should be allowed to talk about Pentecost and the power issued to the Church since that is the last thing that Jesus established before the Church got properly started.
Paul : Same answer. Mention it once then concentrate on Jesus and him crucified.
Apollos : What about the resurrection ? Without the resurrection noone can die with Jesus and be resurrected and thereby be born again and there is no salvation at all ?
Paul : Same answer. One sentence then back to concentrating on Jesus and him crucified.
Apollos : And Jesus' death ? If he had hung on the cross, shed his blood then miraculously been pulled off the cross and healed by the power of God rather than resurrected then that would have mattered nothing. Death is what a proper crucifixion produces.
Paul : Nope. Jesus and him crucified.
Apollos : By now we've removed most of the actual gospel !