In plain words
Samyak Dṛṣṭi Is the Root Cause of Man's Śānti
He came to know the truth that only when one keeps under one's own control the five senses God has granted does this Ātma-jñāna come. First of all, samyak dṛṣṭi, he said. Without samyak dṛṣṭi, humanness has no meaning at all. This samyak dṛṣṭi is not only what one sees with the eyes of skin. You must look at the world with the vision of the heart. Your vision must spring from the heart. All that is seen with the eye is “yadṛśyaṃ tannaśyaṃ”. At some time or other it will surely vanish. On the day man develops this samyak dṛṣṭi, on that very day samyak bhāva arises. Your feeling too must take shape as the feeling of the heart. This very feeling of the heart takes shape as samyak vāk. Only when it has turned into this samyak vāk does samyak śravaṇa also arise. Through samyak śravaṇa he goes on doing samyak karmas. So the root cause of man's Śānti is samyak dṛṣṭi. The heart is like a tranquil tank in man. When in this tank we gather sacred speech, hearing and vision, all bound up with the heart, then a sacred feeling comes to us in everything. This is not merely physical; it is a mark of the spiritual, of nivṛtti. Seeing with the eyes, hearing with the ears, experiencing with the mind, speaking with the mouth: all these are merely of Prakṛti. All these are the fruits of pravṛtti. All these marks of pravṛtti go together with the negative. Only when you join to everything the feeling bound up with the heart does it become positive. Look at the bulbs: negative. But unless the current called positive enters them, they have no entry at all.
Every sādhaka of today, merely by sādhanas of this kind, seeing with the outer eyes, hearing with the outer ears, speaking with the outer tongue, thinking with the outer mind, cannot know Ātma-jñāna however many years pass; he cannot attain it, he cannot enjoy it. For six years the Buddha built up this samyak dṛṣṭi in himself.