Bhagavad Gita, Chapter 6, Verse 35

The Deity said: Without doubt, O mighty-armed, the mind is restless, and difficult to control; but through practice and renunciation, O son of Kunti, it may be governed.

Krishna agrees the mind is hard to control, then gives Arjuna a way through.

This is a reassuring answer. Krishna accepts Arjuna's struggle rather than dismissing it, and then points to two concrete tools, consistent practice and detachment, not a vague promise that it'll get easier on its own.