The key to wise thought is to sense the energy state behind the thought.  If we pay attention, we will notice that certain thoughts are produced by fear and the small sense of self.  With them will be clinging, rigidity, unworthiness, defensiveness, aggression, or anxiety.  We can sense their effect on the heart and the body.  When we notice this suffering we can relax, breathe, loosen the identification.  With this awareness the mind will become more open and malleable,  with this pause we return to our true inner nature.  Now we can think, imagine, and plan, but from a state of ease and benevolence.  It's that simple. 
                                                                                                        ---Jack Kornfield, The Wise Heart