The Foundations of the Knowledge of the Usul
In the Name of Allâh, the Most Beneficent, the Most Merciful
The Prophet (PBUH) said: “If Allah intends good for anybody then he gives him understanding (fiqh) in deen”.
It is not possible for the one with understanding (fiqh) to be without usul al-fiqh or for the usuli (the one who knows usul al-fiqh) to do without fiqh if he wants to have understanding (of the deen). - Shaykh Al-Uthaymin, Kitab Al-Ilm