It is possible for you to be totally blind to something you are doing wrong that ought to be obvious to you.
1 And the Lord sent Nathan unto David. And he came unto him, and said unto him, There were two men in one city; the one rich, and the other poor.
2 The rich man had exceeding many flocks and herds:
3 But the poor man had nothing, save one little ewe lamb, which he had bought and nourished up: and it grew up together with him, and with his children; it did eat of his own meat, and drank of his own cup, and lay in his bosom, and was unto him as a daughter.
4 And there came a traveller unto the rich man, and he spared to take of his own flock and of his own herd, to dress for the wayfaring man that was come unto him; but took the poor man’s lamb, and dressed it for the man that was come to him.
5 And David’s anger was greatly kindled against the man; and he said to Nathan, As the Lord liveth, the man that hath done this thing shall surely die:
6 And he shall restore the lamb fourfold, because he did this thing, and because he had no pity.
7 And Nathan said to David, Thou art the man. Thus saith the Lord God of Israel, I anointed thee king over Israel, and I delivered thee out of the hand of Saul;
8 And I gave thee thy master’s house, and thy master’s wives into thy bosom, and gave thee the house of Israel and of Judah; and if that had been too little, I would moreover have given unto thee such and such things.
9 Wherefore hast thou despised the commandment of the Lord, to do evil in his sight? thou hast killed Uriah the Hittite with the sword, and hast taken his wife to be thy wife, and hast slain him with the sword of the children of Ammon.
10 Now therefore the sword shall never depart from thine house; because thou hast despised me, and hast taken the wife of Uriah the Hittite to be thy wife.
11 Thus saith the Lord, Behold, I will raise up evil against thee out of thine own house, and I will take thy wives before thine eyes, and give them unto thy neighbour, and he shall lie with thy wives in the sight of this sun.
12 For thou didst it secretly: but I will do this thing before all Israel, and before the sun.
13 And David said unto Nathan, I have sinned against the Lord. And Nathan said unto David, The Lord also hath put away thy sin; thou shalt not die.
14 Howbeit, because by this deed thou hast given great occasion to the enemies of the Lord to blaspheme, the child also that is born unto thee shall surely die. (2 Samuel 12)
David was an unusually wise man with a heart good enough that the Lord described it like his own. How did he not perceive that he was the man Nathan was talking about? Furthermore, why was Nathan even needed to help him see that he had done this, when David was so easily able to correctly judge the fictional man in Nathan’s account?
God, by default, shows us right and wrong. When we turn away from what he has told us in our conscience, we remove ourselves from that insight. This happens situationally, meaning we still have the capability to know right and wrong in other things. David had turned against his conscience in the matter of Bathsheba. Nathan’s story was sufficient to help him use the light he still had to judge the situation and then apply it to his own.
It is unlikely a servant of God is going to come help you discern between right and wrong—though they might. It is very likely, though, that you will be given many testaments of the fruits of your actions in your life and in the lives of those you know. Be wise enough to recognize these signs in your own life, and to learn from the mistakes of others by wisely applying them to your own decisions.