There is no fear in love (agapē | ἀγάπῃ | dat sg fem), but perfect love (agapē | ἀγάπη | nom sg fem) drives out fear because fear has to do with punishment. So the one who fears has not been perfected in love (agapē | ἀγάπῃ | dat sg fem).
Reference
1 John 4:18
Sequence
97