Imam al-Shafi'i (may Allah have mercy on him) said: I heard some of the people of knowledge saying (something), which I describe: "You will never be able to be just" [Surah al-Nisa: 129] in what is in your hearts, so "do not incline completely" [Surah al-Nisa: 129], meaning that you should not follow your desires and actions, for that would be inclination in deed, which is not permissible for you, so that "you leave her as one suspended" [Surah al-Nisa: 129]; because Allah, the Lord of Might, does not take to account what is in the heart, but He takes to account actions and words, and whoever inclines by word and deed, that is complete inclination.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14739