In plain words
Along with these sādhanas, you must purify your mind. What is in the heart must be spoken in words; what is spoken in words must be shown in action. This is what true humanness is. God is searching for just such a man, one who has this trikaraṇa śuddhi.
The Buddhi Is Like a Pure Mirror
God has granted man a sacred Buddhi so that he may come to know himself. The Buddhi is like a pure mirror. When one side of a mirror has been coated with a chemical, you can see your own reflection in it. If you hold up a mirror that has no coating, you see whatever lies behind it, but you do not see yourself. In the same way, if you want to recognise your own true form, you must coat one side of the mirror called the Buddhi with the chemical called Prema. But you have only held up the mirror of the Buddhi before you; you are not coating it with the chemical of Prema. That is why you are unable to see your own true form. In a mirror with no coating you see the faces of others; how could you see your own face!
That is why today every single person, “Who are you, sir? Where have you come from?” they ask the one before them, but “Who am I? Where have I come from?” they do not ask themselves. First of all you must drop the question ‘Who are you?’ and begin the enquiry ‘Who am I?’ Stop looking at the faults of others, and recognise the faults within you. God granted you the Buddhi so that you may see yourselves, not to look at the faults of others.
Today everyone, from a small child to a grown man, is putting his Buddhi into worldly matters. That is why they forget their own true nature. Man is going down into the depths of the ocean; he is going up into the sky. But he does not go into himself.