Verse 54

किंचिदामृष्टरूपं यद्ब्रह्म तच्च स्थिरं मनः ।कल्पना सत्सदैवैतत्सदिवोपस्थिता हृदि

In plain words

That Brahman, touched by the faintest trace of form, is itself the steady mind — a thing whose very nature is kalpanā, ever present in the heart as though it were real.