1 Corinthians 2:3

2:3 And I was with you in weakness and in fear and with much trembling.

1 Corinthians 16:10

16:10 Now if Timothy comes, see that he has nothing to fear among you, for he is doing the Lord’s work, as I am too.

1 Corinthians 9:27

9:27 Instead I subdue my body and make it my slave, so that after preaching to others I myself will not be disqualified.

1 Corinthians 1:17

1:17 For Christ did not send me to baptize, but to preach the gospel – and not with clever speech, so that the cross of Christ would not become useless. ¹ 

1 Corinthians 10:12

10:12 So let the one who thinks he is standing be careful that he does not fall.

¹ tn Grk “would not be emptied.”