Christians are called to freedom, yet this freedom is not a libertarian freedom in which we simply get to do whatever we want. In fact, the Bible explains several qualifications of our freedom that indicate that our freedom is constrained. In Galatians 5:13-26 we are told that there are two key constraints to our freedom and the path we choose is clearly demonstrated.
The parable of the vine and its branches is a rich passage that Jesus used to explain four functions that are part of our union with Christ. Some people think this parable conveys something of the substance of the relationship of the branches and the vine, but this causes an interpretive issue that is inconsistent with the rest of scripture. This is a sermon I preached last Sunday which explains 4 functions of our union with Christ that Jesus explains using this parable.