Uthaimeen on the Importance of studying Tawheed

So verily the knowledge of tawheed [the
oneness of Allaah] is the noblest of sciences, and the greatest in
rank, and most obligatory to be studied because it is the knowledge of
Allaah the Exalted, and His Names, and His Attributes, and His Rights
upon His slaves.-- Shaykh Muhammad Saalih Ibnul 'Uthaymeen