Ulladhu Narpadhu - Verse 28

Just as one would dive (restraining one’s speech and breath) in order to find a thing which has fallen into the water, one should dive within (oneself) restraining speech and breath with a keen mind (that is, with a keen and
penetrating attention fixed on the feeling ‘I’), and know (the real Self, which is) the rising-place (or source) of the ego, which rises first. Know thus.