Over the years I've learned how to lock myself up in a prison of hope, knowing that God has nothing but His best planned for me. He promised me things concerning my ministry and my life.

This quote means that the speaker has learned to stay positive and hopeful, even when difficult things happen in their life. They believe that God has something special planned for them, and will deliver on His promises, even if this takes time. The speaker may refer to a particular area in life – for example, their ministry. This means that the speaker trusts that God will help them to succeed in this field, even if it seems like an impossible task.