2 Peter 2:19 - They promise them freedom, while they themselves are slaves of depravity - for a man is slave to whatever has mastered him.
Since the beginning people have fought to be free. The desire for freedom has united people that would not otherwise come together. Sometimes it is for physical freedom, fighting against oppressive and controlling governments. Other times it has been religious freedom, so that people can believe and think what they want.
Even today we often hear the promise of freedom. Government officials will promise freedom to gain support in the elections. Sometimes it is unclear what exactly they are promising freedom from, but the ‘promise’ is still there. Just like this verse says, “they promise freedom, but they themselves are slaves to depravity.” Often these promises come those who they themselves are slave to evil and depravity.
It doesn't really matter who the promise comes from, in terms of men, we must realize that we are never ‘truly’ free. There is always something that we answer too; something that drives us. We have freedom of choice, but we once we choose we are subject to the consequences of that choice. It controls you, and your decisions and actions that follow stem from the original one.
We all have something we live for, whether it be God, our self, money, success or, like this verse suggests, moral corruption. Once we are living for something, that thing controls our thinking and our actions. Make sure you are living for something that is worth it.