1 Corinthians 2:3

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

1 Corinthians 9:22

9:22 To the weak I became weak in order to gain the weak. I have become all things to all people, so that by all means I may save some.

1 Corinthians 9:20

9:20 To the Jews I became like a Jew to gain the Jews. To those under the law I became like one under the law (though I myself am not under the law) to gain those under the law.