Did you know that your private thoughts are crucial to your spiritual walk? Many Christians do not consider unsuitable thoughts as sin and believe their thoughts are unseen and harmless. But what Jesus said does not agree with this at all. He clearly taught that God knows all our hidden thoughts and that entertaining a thought is equal to performing the outward deed. Throughout scripture, believers are commanded to have a pure thought life. In this book, we will consider the dangers of sins of the thought life and discuss how we may have a thought life pleasing to the Lord.