Verse 16

किंचिदुच्छूनता सैव महद्भिः कैश्चिदुच्यते ।तस्येच्छा कार्यतां याता यया सेच्छः स जायते ॥ १६ ॥

In plain words

That very thing is called ‘a slight swelling’ by certain great ones. Will has become its effect, the will by which he comes to be one who wills.