The events that are mourned on Tisha B'Av are the result of disobedience. Rav Sha'ul recounts the Israelites disobe-dience in the wilderness, and the horrifying results. We, as Believers, should take heed to Torah. And all these blessings shall come upon you and overtake you. Obedience is an essential part of faith.
Faith expresses itself in obedience.
There is no true faith without obedience. Biblical obedience demands listening to the voice of God through a personal covenantal relationship. The clear will of God is his written word. When we replace the written word with some mumbo-jumbo, then we run the risk of falling into deception, or listening to our own heart. This can be very dangerous.