Spiritual Advancement: Measuring Advancement

                                                                  Q. Can you kindly explain what are the potential realizations in each stage of chanting i.e. nama-aparadha, nama-abhasa, and suddha-nama? Is there any positive realization (that which is favorable to Krishna consciousness) for a person in nama-aparadha stage? In other words, how can one know that one is progressing from one stage to another?