Matthew 5:14

5:14 You are the light of the world. A city located on a hill cannot be hidden.

Matthew 6:27

6:27 And which of you by worrying can add even one hour to his life? ¹ 

Matthew 7:18

7:18 A good tree is not able to bear bad fruit, nor a bad tree to bear good fruit.

[6:27]  ¹ tn Or “a cubit to his height.” A cubit (πῆχυς, phcu") can measure length (normally about 45 cm or 18 inches) or time (a small unit, “hour” is usually used [BDAG 812 s.v.] although “day” has been suggested [L&N 67.151]). The term ἡλικία (Jhlikia) is ambiguous in the same way as πῆχυς (phcus). Most scholars take the term to describe age or length of life here, although a few refer it to bodily stature (see BDAG 436 s.v. 3 for discussion). Worry about length of life seems a more natural figure than worry about height. However, the point either way is clear: Worrying adds nothing to life span or height.