The Importance of Yakin in Conviction

Yakin is used for absolute certainty and that's why it's phrased like a Ainu Le'akin in the Quran. Hukkul Yakin could even be thought of as you've experienced something so you know how real it is. So things that are absolutely certain get associated with the word yakin And so here Allah says wafil al-ad-dil mukinin in the earth.