“He who has a high look and a proud heart, I will not tolerate.”
It is a good thing to care about our physical appearance. We should love others enough to make the effort to be clean and presentable. But it is not good when concern for one’s appearance consumes one’s attention. The Bible says “a proud look” is one of the very worst of sins. In fact, it is listed first among the seven sins God hates most: “These six things does the LORD hate; yes, seven are an abomination to Him: a proud look . . .” (Prov. 6:16–17).
So, go ahead and dress nice and comb your hair. But remember that while people are judging you by your appearance, God is judging your heart.