Shaykhul Islaam Ahmad ibn Taymeeyah 728AH (May Allah have mercy on him) said,

والجهل والظلم:هما أصل كل شر كما قال سبحانه “وحملها الإنسان إنه كان ظلوماً جهولاً”.

“Ignorance and oppression: these two are the foundation for every type of evil as Allaah تعالى said:

{But man bore it. Verily, he was unjust (to himself) and ignorant.} [Surah al-Ahzaab (33): 72]

Source: Iqtidaaus Siraat 1/148