it is unwise to judge a person by their appearance
We are often told not to judge people by their appearance, because for a person, abilities are far more important than appearance. Throughout history, there are numerous examples of outstanding people with remarkable achievements who are just plain or not good-looking at all.
However, nowadays some people hold the belief that appearance outweighs abilities, partly because some beautiful people seem to have advantages in competitive situations like job interviews and have been given more opportunities than others.
Nevertheless, I still firmly believe that abilities are more important. For one thing, although good looks are easy on the eye, it is always one's abilities that create values that really matter. For another, while people's good looks were born to them, abilities have to be gained through deliberate self-cultivation and years of hardworking which speak more of people's true colors. Last but not least, abilities grow over time while good looks only fade. Eventually, it is the abilities that help people succeed, so it is safe to say that abilities will always bring more to life than good looks.