Definition
**Sword Heart Illumination (剑心通明)** is a classic Daoist cultivation concept: the cultivator’s heart becomes a clear mirror that reflects the sword without distortion. In Xianxia, this is the foundational insight for any true Sword Immortal—it doesn’t grant raw power, but it *unlocks* the ability to intuitively wield sword techniques at a higher level. Diancai Immortal’s explanation is pure Xianxia pedagogy: understanding comes not from memorizing stances, but from *becoming* a sword. Also note the recurring motif of “fighting to temper the heart”—battles in this genre are often as much about spiritual refinement as about winning.