A fool wonders, a wise man asks

अपृष्ट्वैव भवेन्मूढः
ज्ञानं मनसि चिन्तनात् ।
अपूर्णः कुरुते शब्दम्
न पूर्णः कुरुते घटः ॥

One turns foolish by wondering about knowledge in mind without asking (others). A pot, not full, makes sound (thereby asking you to fill it), but not the one that is full.

Curiosity is the key to knowledge.
A fool wonders, a wise man asks.
There is no such thing as a stupid question.
He who asks a question is a fool for a minute.
He who does not remains a fool forever.A fool wonders, a wise man asks.