Wala nukallifu nafsan illa wusAAaha waladayna kitabun yantiqu bilhaqqi wahum la yuthlamoon (surah Muminun: 62)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(23:62) We do not burden anyone with more than he can bear. *55 And We have a book which tells accurately (about everyone), *56 and the people will in no case be treated unjustly. *57

Wa laa nukallifu nafsan illaa wus`ahaa wa ladainaa kitaabuny yantiqu bilhaqqi w ahum la yuzlamoon

*55) The enunciation of this fundamental proposition, in the context in which it occurs, is very meaningful. In the preceding passage (vv. 57-b1), the characteristics of those people, who deserve true success, have been stated, and in this verse (62), it has been made clear that those excellent qualities can be attained by anyone who tries to achieve true success, as if to say, "The conditions We have laid down for true success are within the reach of those who strive for it, for 'We do not burden ... Therefore if you, O disbelievers, desire to achieve true success, you should follow the example of the Believers from among yourselves, who have really attained it"
*56) According to the Qur'an, an elaborate "conduct book" of every individual is being maintained accurately. This records every word he utters, every deed or act he performs, even every hidden thought and intention that he cherishes in his heart and mind. See also AI-Kahf (XVIII) :49 and E.N. 46 thereof.
*57) That is, neither a person will be accused of and punished for something he had not done, nor will he be deprived of the full reward of a good act that he had done.