In plain words
How must one write against him? All like this, nothing but bad thoughts. They have settled in them from the feet to the head. Then there are many great sages. At all times they foster only good thought. They seek only good company. They listen only to good things. That is why the radiance of their faces turns into the radiance of Brahman. The moment we see them, a feeling of attraction arises in us. So for every good thing and bad thing, our face itself is the mirror. Our face itself is the casting of the mind. Our face itself is the mind's notice board. So first of all we must try to make our mind pure. A small example. Some of you here may be science boys too. Some items go out on Ākāśavāṇī in Calcutta or in Delhi. If we switch on the radio at once and adjust the station, within a second we hear here the whole programme going on in Calcutta. That is, sound travels some thousands of miles in a second. Then light: the science students may know that it travels one lakh eighty-six thousand miles in a second. But in their research (this research was done long ago, at some time or other; it is very old research), in this old research it is one lakh eighty-six thousand miles a second; now many modern researches are coming in, so it goes crores of miles, this light. But the mind races with far greater speed than light. Light beyond sound, mind beyond light. This mind moves with even greater speed. If we do not keep this mind of such speed under proper control, great danger follows. If a car going at speed has its brake or its clutch or its accelerator or any part of the steering a little loose, an accident happens. So, since the mind has great speed, since it is joined to our thoughts, keeping our thoughts under proper control is for our own good. Whether anger comes, or sorrow comes, or any other kind of disappointment arises, we must not give it room at once. We must enquire into it calmly, look for its causes, weigh its good and bad, and only then give this matter room. Otherwise, if we follow the mind at once, we become beasts. So:
The man who takes the mind as his support falls lower than a beast and comes to ruin; the wise man who takes Buddhi as his support turns into Paśupati…
That is, Buddhi must enquire into everything the mind has thought.