Cross reference
Luke 12:25
25 And which of you by taking thought is able to make himself any taller?
Matthew 5:36
36 You may not take an oath by your head, because you are not able to make one hair white or black.
Matthew 6:27
27 And which of you by taking thought is able to make himself a cubit taller?
Luke 19:3
3 Made an attempt to get a view of Jesus, and was not able to do so, because of the people, for he was a small man.