एको निष्कम्प आत्मा प्रचलति मनसा धावमानेन तस्मिं -स्तिष्ठन्नग्रेऽथ पश्चान्न हि तमनुगतं जानते चक्षुराद्याः ।यद्वत्पाथस्तरङ्गैः प्रचलति परितो धावमानैस्तदन्तःप्राक्पश्चादस्ति तेषां पवनसमुदितैस्तैः प्रशान्तैर्यथावत् ॥ ३० ॥
In plain words
Ātma, the one unmoving Self, seems to run only because Manas, the mind, is running. Ātma stands within that mind, ahead of it and behind it, unnoticed by the eye and the other senses. Water too seems to race when waves cross its surface, though it was there before them, pervades them now and remains after the wind has fallen and the waves are still.
Close to the Sanskrit
The one unmoving Ātma—the Self—seems to move because Manas, the mind, runs about. Present in that mind, before it and behind it, Ātma is not known by the eye and the other senses that follow the mind. Water likewise seems to move through waves racing everywhere; it is within them and exists before and after them. When the wind-raised waves grow still, the water remains just as it was.