This saying comes about because when we are deeply in love with someone we are able to overlook all their bad faults. Something about them overpowers everything. When I was young I had a boyfriend with very bad acne and people used to ask me what I saw in him but I thought he was gorgeous and hardly noticed his skin. After we broke up I could see what others saw although I still thought he was a nice person and we were friends for years before we went out separate ways. Unfortunately this can also work in a bad way when one person abuses another either emotionally or physically. The victim will make excuses for the abuse because he/she is so in love with them and does not want to believe they are doing wrong. In a good relationship a couple will be able to recognise their partner's minor faults but be able to overlook them. Taking the rough with the smooth is all part of being in a truly loving relationship as no one is perfect.