Cross reference
Luke 12:25
25 and who of you, being anxious, is able to add to his age one cubit?
Matthew 5:36
36 nor by thy head mayest thou swear, because thou art not able one hair to make white or black;
Matthew 6:27
27 `And who of you, being anxious, is able to add to his age one cubit?
Luke 19:3
3 and he was seeking to see Jesus, who he is, and was not able for the multitude, because in stature he was small,