Hawzah News Agency – The merciful prophet of Islam (pbuh) says:

أشَدُّكُم وأقواكُمُ الذي إذا رَضِيَ لَم يُدخِلْهُ رِضاهُ في إثمٍ ولا باطِلٍ ، وإذا سَخِطَ لَم يُخرِجْهُ سَخَطُهُ مِن قَولِ الحَقِّ ، وإذا قَدَرَ لَم يَتَعاطَ ما لَيسَ لَهُ بِحَقٍّ.

'The strongest and toughest of you is he who, when he is happy, his happiness does not lead him to committing a sin or anything wrong, and when he gets angry, his anger does not prevent him from speaking the truth, and when he is empowered in any way, he does not take hold of that which is not lawfully his.'’

Source: Maani al-Akhbar, p. 366, no. 1