Whatever happens inwardly has direct repercussions on what takes place outwardly. The inner light and purity cannot be hidden, nor can the defilements. We sometimes think we can portray something we are not. That is not possible. The Buddha said that one only knows a person after having heard him speak many times and having lived with him for a long time.
People generally try to show themselves off as something better than they really are.
Then, of course, they become disappointed in themselves when they fail, and equally disappointed in others. To realistically know oneself makes it possible to truly love. That kind of feeling gives the light-heartedness to this job in which we're engaged, which is needed. By accepting ourselves and others as we truly are, our job of purification, chipping away at the defilements, is made much easier.