In plain words
Those who want Swami, who want to offer Swami's ideals in the form of practice, need no special teachings. Students who hold firm the resolve, ‘All that Swami says is for our good, for the welfare of the students, for the good of the world, for the progress of our society,’ need not be taught. Even those who know nothing at all of Swami's principle can easily be taught. But it is very hard to tell the fools who act as though they knew Swami's principle, hold conversations like people who know everything, act in their conduct too as though they knew, and make no effort to learn anything.
Spiritual learning is like the ocean
Students must first of all recognise well the value of speech. Next, they must observe well the power of the mind. They must also recognise well the breadth of the heart. When they recognise these three with śraddhā and Bhakti, no fault of any kind can find a way into them. What makes us recognise this heart, this mind and this speech is spirituality itself. All that is shaped by what is seen, that appears, that is heard, that is felt, that charms: all of it together is only the world. What teaches about such a world is education. Call it Physics, call it Maths, call it Chemistry, call it Bio science: each of them only takes apart the world that is there and teaches it in detail! What teaches the unseen, the unheard, and what delights the mind is spirituality. All these learnings of the natural world have sprung from spirituality. As it is said, ‘Nadīnāṃ sāgaro gatiḥ’. ‘Adhyātmavidyā vidyānāṃ’: of all learnings, spiritual learning is the chief learning. Vedānta has gone on teaching that this alone is the great learning, the highest learning. All rivers, in the end, reach the sea! Each of these worldly learnings is like one river. Spiritual learning is like the ocean. All these learnings must go back and join the place they came from. If instead this learning stops halfway, in something it needs for itself, it can never be whole.