The author distinguishes between 'pratyaksh anubhav' (direct sensory experience) and 'anubhuti' (inner realization). Direct experience alone is insufficient for writing; it is only when the experience transforms into 'anubhuti'—appearing in blazing light before the soul—that it becomes the true basis for creation. This is why he couldn't write immediately in Hiroshima despite witnessing everything, but could write later when the realization struck him upon seeing the shadow on the stone.