Acquire knowledge and teach people. Learn along with it dignity and tranquility and humility for those who teach you and humility for those whom you teach. Do not be tyrannical scholars and thus base your knowledge upon your ignorance.
Umar ibn Al-Khattab
Acquire knowledge before conveying it otherwise it'll be based on ignorance and as stated by Umar ibn al-Khattab (ra), it will be as if you're a tyrannical scholar.