Are you in a program working the steps or are you trying to understand this on your own? It's the gateway to recovery and holds so very much. People work for years in groups and with sponsors on understanding this step and taking it to heart.
For me, it has meant: "You mean, I really don't know what's best for him??" For me, it means accepting that there is so very much more to another person's life, even someone I'm close to, than I will ever know. I don't know everything that goes on inside of him and I don't have any control over his choices and feelings. It's a humbling step, yet incredibly empowering. For me, it's the doorway to moving beyond codependent thinking and learning to live in freedom, confidence and peace of mind.