The sin of familiarity is a common problem in relationships. It is the tendency to take a partner for granted and to become complacent in the relationship. This can lead to a lack of appreciation and respect for the other person, and can eventually lead to the end of the relationship. It is important to remember that relationships are built on mutual respect and appreciation, and that taking your partner for granted can be detrimental to the relationship. Taking the time to show your appreciation and to express your love and admiration for your partner can help to keep the relationship strong and healthy.