Why can setbacks and pressure sometimes reveal an inner light a person never knew they had?

This source-based Hagut Yosef essay explores the question: Why can setbacks and pressure sometimes reveal an inner light a person never knew they had? The canonical Hebrew article develops the theme through Torah sources and reflection on human life. This localized discovery layer preserves the meaning and source identity; it does not add a new halakhic, historical, psychological, medical, legal, or empirical claim beyond the Hebrew source.