It is He who revealed to you the Book. Some of its verses are definitive; they are the foundation of the Book, and others are unspecific. As for those in whose hearts is deviation, they follow the unspecific part, seeking descent, and seeking to derive an interpretation. But none knows its interpretation except God and those firmly rooted in knowledge say, “We believe in it; all is from our Lord.” But none recollects except those with understanding.

The Holy Quran · Aal-i-Imraan (The Family of Imraan) · 3:7