A city with broken down walls is defenseless. If an attack is launched on it there will be big trouble. We may know how to build a wall for a city but how do we find self control?
In the book of Galatians it talks about the fruits of the Spirit. Self control is one of those fruits. But how do we experience the fruit of self control? Like any fruit it comes with maturity and walking in the Spirit. We learn to walk in the Spirit when we spend a lifetime studying Gods word.