Be pure in your thoughts and the behaviors will follow. To think on sinful things is not the problem, it is to allow those thoughts to go unchecked. Your creative power lies within your thought patterns.
Thinking on certain things produces them, right or wrong, what you meditate on is given life, because I have entrusted man with this indelible authority. Your mind and mouth have the power to build worlds.
What you say into the atmosphere has power and you must give an account for every word spoken. Be aware of your emotions, being angry, offended or affected by past trauma will lead to a poor choice in thoughts and words.
Your power is in your words and the enemy covets it, he does not have the ability to create, unless he convinces you to do so on his behalf. The reoccurring moments of pressure are a snare, designed by an enemy wanting to harvest your power.
Ephesians 4:29
Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear.
I Might Be a Prophet 