1 Korintus 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.

1 Korintus 15:14

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

1 Korintus 15:58

15:58 So then, dear brothers and sisters, ¹  be firm. Do not be moved! Always be outstanding in the work of the Lord, knowing that your labor is not in vain in the Lord.

[15:58]  ¹ tn Grk “brothers.” See note on the phrase “brothers and sisters” in 1:10.