אֵינוֹ דוֹמֶה לוֹמֵד מֵעַצְמוֹ לְלוֹמֵד מְרַבּוֹ

ביטוי (אנגלית)

The self-taught is not comparable to one who learns from his teacher

הגדרה (אנגלית)

Learning with a teacher is preferable to self-study. Studying with a teacher allows for sharpening the subject through conversation and questions, and improves the ability to remember the material learned.

(Even though you are a great sage, the self-taught is not comparable to one who learns from his teacher. — Ketubot 111a)