Should we forgive those who hurt us?

Does God say we must love everyone? And what does that mean? Does God say we must forgive people, even if they never said sorry? Is it true that we need to not only forgive, but forget? 

The main topic of this episode deals with forgiveness, but the first section unpacks the common misunderstanding of John 8:7 which says "he without sin throw the first stone". What does that mean? And does it suggest that Christians need to keep quiet when they see other Christians do what displeases God?