There are three levels of service. The highest level is that of one who performs good deeds the whole day and yet feels that he has not acheived anything. The second level is someone who, though he has not done anything, knows that he has not corrected anything in this world. This is good, and there is hope for him that he might correct his ways. However, someone who is righteous in his own eyes deceived himself all his life; his good deeds will be lost.