Proverbs 27:16-19

¹⁶The north wind is sharp, but it is called by name propitious.

¹⁷Iron sharpens iron; and a man sharpens his friend's countenance.

¹⁸He that plants a fig tree shall eat the fruits of it: so he that waits on his own master shall be honored.

¹⁹As faces are not like other faces, so neither are the thoughts of men.