In plain words
When you have become one who recognises the principle of all these limbs, you will not set about arguing; you will not set about it at all. That is, the way you will be satisfied is this: he is describing well the limb he held, and that is right indeed. No matter who speaks, you will set about saying ‘right right’, but you will not set about saying ‘wrong’. Before we go down into argument and debate, we must try to recognise to some extent our strength, this of ours. If you go down into argument without enquiring so, you will have to suffer defeat. I am giving you one from the experience you know every day.
In big, big cities, on some main roads, they set up big, big circles. For the traffic going this way, there is ‘keep left’. Four roads meet there. Now, you are setting out from the east and coming along. Only if you look out for these three, North, south, west, will your journey go properly; but if, coming from the east, you set off without noticing whether anything is coming along these roads, north, south and west, there will be an accident. So only when we watch these three roads can some safety come to us who travel on this fourth road; but if we set off with our eyes shut, without watching the other three roads, without seeing whether those roads are empty or not, the danger is to ourselves. This great circle called Prakṛti has four roads, called the Veda, the Śāstra, the Itihāsas and the Purāṇas. But if, going along one road called the Purāṇa, you do not notice what is in these three, the Veda, the Śāstra and the Itihāsa, how can you win the argument? Many know the Veda but do not understand it. Some know the Śāstra but do not understand the Veda at all. In the same way, those who know the Itihāsa may not know another. But if we have developed the feeling of oneness for all of them, for what is called love of God, the divinity in these four will grant us all our aims. When we take Him as our guide, when we take Him alone as the ideal for our life, when we appoint Him alone as the charioteer of the chariot of our life, no dangers of any kind come to us.