Tell me your understanding of the sentence in the Three-Character Classic that jade cannot be used until it is polished.

The human mind is born like a piece of white paper. Later, through the accumulation of experience and learning, various pictures are drawn on the white paper.

Jade is obviously different from white paper. White paper contains nothing, while jade contains potentially useful ingredients and value. The traces on the white paper are mechanically added by external forces, while polishing the jade allows him to fully unleash his potential.