Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said:

And Imaan is known about a man, just as all the states of his heart are known by way of his (outward) allegiances, enmities, his rejoicing, anger, hunger, thirst, and other such affairs. For these matters have certain outward binding necessities (lawaazim dhaahirah) and the outward matters necessitate inward matters. And this is a matter known, the people know this concerning the one that they have experienced and tested (jarraboohu wamtahinoohu)…

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[Source: Minhaaj-as-sunnah 8/475] [Translation: Salafipublications.com]

Abu Mu’aawiyah (Abdullah Al-Gambi)