Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

جُبِلَتِ القُلوبُ على‏ حُبِّ مَن أحسَنَ إلَيها، وبُغْضِ مَن أساءَ إلَيها.

'The hearts have been predisposed to love those who do good to them, and to dislike those who do bad to them.'

Source: Tuhaf al-Uqul, no. 37