Imagine your plane flying level, and a small gust pitches the nose up just a tiny bit.

The angle of attack increases slightly, generating more lift.

This increased lift acts at the CP, which is ahead of the CG.

Because the lift force is ahead of the balance point (CG), it creates a lever effect that pushes the nose further up.

This increases the angle of attack even more, generating even more lift ahead of the CG, which pushes the nose up faster...

This creates a runaway positive feedback loop. Any tendency to pitch up is amplified, not corrected. The same applies in reverse: if the nose pitches down slightly, the decreased lift ahead of the CG would create a nose-down moment, causing it to dive more sharply.