The general meaning can be understood as: beautiful appearance is similar, nothing special, but it is not easy to find a person with interesting heart. It means not to chase people's external appearance too much, but inner beauty is the most valuable and cherished.
In fact, everyone has a different understanding of this sentence.
Some people think that when two strangers meet for the first time, their beautiful appearance is the first factor to attract others' attention. But with the passage of time, whether two people can develop from strangers to mature people, and then become friends or lovers, appearance is not a prerequisite, and caring about each other's soul is the continuous attraction.