1 Corinthians 15:14

15:14 And if Christ has not been raised, then our preaching is futile and your faith is empty.

1 Corinthians 15:10

15:10 But by the grace of God I am what I am, and his grace to me has not been in vain. In fact, I worked harder than all of them – yet not I, but the grace of God with me.