। ॥ १२ ॥
In plain words
Hold the mind's thought-making still for one moment; then two; then three. Practise it this way, step by step, with real effort — you who long to know Brahman firsthand.
Close to the Sanskrit
Thus, in one, two, three moments, the restraining of vikalpa is to be practised gradually, with effort, by those who long for the direct experience of Brahman.