Thoughts are creative, but for most people, thoughts and desires occur at an unconscious level. On the surface, you might want a new job or a partner to share your life with. You might pray for these things to appear in your life and yet they do not. This is because, at an unconscious level, you are harboring contradictory thoughts, beliefs and desires.
For example, at an unconscious level, you might believe that you are not good enough or that you are unwanted or unloved. Or you might have decided that love hurts or that love leads to pain and separation and so you prefer to be alone.
These things are in direct conflict with your conscious thoughts and desires and so life does not know how to respond to you. More than likely, your unconscious beliefs and desires will prevail.