Never judge someone quickly by the way he/she looks beacuse beauty flows from the heart not from the face.
Never be too fast to judge someone beacuse you never know may be at that time that person is going through something bad that you never have experienced but he/she is going through that situation so never be too quick to judge someone by his/her appearence .
Might be your those judgemental words hurt him/her heart so badly that he/she can never forget even that person's condition changes with the time.
Always see the both sides not only the one that on the upper surface sometimes bottom hides something more than surface.
In a nut shell, Always be careful when meeting with the people whom you don't know and don't be too quick to judge them especially by there appearence.