Sin is always disturbing Life
From the grandson of the Prophet sallallaahu ‘alaihi wa sallam, Al-Hasan ibn’ Ali, the Prophet sallallaahu ‘alaihi wa sallam said,
دع ما يريبك إلى ما لا يريبك فإن الصدق طمأنينة وإن الكذب ريبة
“Leave the doubt and move on what is no doubt. Surely honesty is more to soothe the soul, while lying (cheating) will be disturbing a soul. “
In other lafazh mentioned,
فإن الخير طمأنينة وإن الشر ريبة
“Kindness always brings peace, while ugliness always brings anxiety.” 
In another hadith, from Nawas bin Sam’an, the Prophet sallallaahu ‘alaihi wa sallam said,
البر حسن الخلق والإثم ما حاك فى نفسك وكرهت أن يطلع عليه الناس
“Kindness is a noble with a certain character. While the evil (sin) is something disturbing soul. When evil is done, of course you do not like it appears in the midst of men. “
An Nawawi rahimahullah explains, “Sin is always disturbing and soothing for the soul. In the heart will look edgy and always worried about sin. “
To the extent that if someone is in a confused state, the Prophet sallallaahu ‘alaihi wa sallam commanded to ask her, whether the act was a sin or not. This occurs when the heart in a state of uneasy and have not found how the law of a problem. He sallallaahu ‘alaihi wa sallam never advised on Wabishoh,
استفت نفسك, استفت قلبك يا وابصة – ثلاثا – البر ما اطمأنت إليه النفس واطمأن إليه القلب, والإثم ما حاك فى النفس وتردد فى الصدر وإن أفتاك الناس وأفتوك
“Ask a fatwa on your soul. Ask a fatwa on your heart (he said it three times). Kindness is something that soothe the soul and reassurance. While the evil (sin) is always disturbing to shake the soul and heart. “
Ibn Rajab Al Hanbali rahimahullah explains, “Hadith Wabishoh and the Creator with her suggests that we should always refer to the heart when something is in doubt. If the heart and soul so calm, it is a good and lawful. But if the heart in a state of anxiety, then that means including a sin or haram. “ Remember that the hadith Wabishoh intended to act is unclear halal or haram, a sin or not. Meanwhile, if something is clearly permissible and illegitimate, it is no longer need to refer to the liver.
Thus the name of sin, always troubled soul, make life uneasy. If someone is stealing, cheating, cheating, corruption, committed the sin of even doing a kesyirikan, it is hard to calm his soul.
So what if there is a sin even his heart was so peaceful, serene course? The answer, not a sin or immoral act is justified. The truth is that state of heart full of impurities, which has been covered with black stains because of not being stopped from evil. Allah Ta’ala says,
كلا بل ران على قلوبهم ما كانوا يكسبون
“By no (so), actually what they always try it covers their hearts.” (Surat al Muthoffifin: 14). If the liver is kept covered as immoral, then it is hard to get a clue and do good. Rahimahullah Ibn al-Qayyim said, “If the heart is getting dark, so it’s difficult to know the instructions of truth.” 
اللهم إنى أسألك فعل الخيرات وترك المنكرات
Allahumma inni as-aluka fi’lal khoiroot, wa tarkal munkaroot. O Allah, I beg thee to easily perform a variety of virtues and leave the various munkar. 
Completed at noon on the Bake-Gunung Kidul, 15 Shawwal 1431 H (09/23/2010)
Authors: Muhammad Abduh Tuasikal
 HR. Tirmidhi no. 2518 and Ahmad 1 / 200. At-Tirmidhi said that this hadith is hasan saheeh. Shaykh Al-Albani said that this hadith is authentic.
 HR. Al-Hakim 2 / 51 in Mustadroknya. Al-Hakim said that this hadeeth saheeh sanadnya. Adh Dzahabi confirmed that this hadeeth saheeh.
 HR. Muslim, no. 2553.
 Al-Minhaj Sharh Sahih Muslim, ibn Yahya An Nawawi Syarf, Dar Ihya ‘At Turots, 1392, 16/111.
 HR. Ad Darimi 2 / 320 and Ahmad 4 / 228. Shaykh Al Arnauth Syu’aib said that this hadith dho’if. Shaykh Al-Albani said that this hadith is hasan lighoirihi. See Al Irwa ‘no. 1734.
 Jaami’ul ‘Ulum wal Hikam, Ibn Rajab al-Hanbali, Darul Muayyid, p.. 304.
 Ad Daa ‘wad Dawaa’, Ibn Qayyim Al Jauziyah, Darul Kutub Al ‘Ilmiyyah, first printing, 1424 H, p.. 107.
 HR. Tirmidhi no. 3233, from Ibn ‘Abbas. Shaykh Al-Albani said that this hadith is authentic.