In plain words
A person's mind is like a gramophone record. The songs and words on this record are not seen by us, but they are heard. But the effects of the thoughts in the mind are not heard by us; they are seen. Every thought that arises in the mind is, that is to say, of two kinds: bad thoughts and good thoughts. Bad qualities such as anger, hatred, envy, despair, pomp and Ahaṅkāra show on a person's face like sores. Among those same thoughts, good thoughts such as Satya, Prema, patience, sympathy, kindness and compassion show forth on a person's face as radiance and serenity. We can call it the mould of the mind. That itself, a person's face, is the photograph. Every thought shows outwardly on it like lines. To put it another way, the face is like a notice board. All the effects of the mind show on our face. Some people try to cover up these thoughts. It is not possible to cover thoughts up or to hide them. One can call it nothing but foolishness. You may have heard. You may have read it in books. In the deserts there is a bird called the ostrich. A tall bird. It stands about ten or twelve feet high, this bird. Many hunters go out to hunt this bird. The reason is that its feathers are very large and suited to making all sorts of wonderful designs. Its meat is a great delight to meat-eaters. So many people go out to hunt this bird. What does the ostrich do at that time? Having hidden its long beak in the sand, it thinks nobody has seen it. But this simple bird lacks the knowledge that its body, big as it is, is left outside. In the same way, those who try to hide their faults and their mean thoughts, to cover them up, are no better than this ostrich. It is not possible to hide this in the least. Even if you hide those bad thoughts, they do not stay hidden. They show on your face. They shine out.
These thoughts are very vast. They are far subtler than electricity. Every thought has a form. Every thought has a form.