In plain words
To think that the body alone is what matters, and not the one who dwells in the body, is the first principle of man's Ajñāna. There can be an ocean without waves: but without the ocean there are no waves. The Ātma did not come for the sake of the body; the body was gained only for the sake of the Ātma. That men forget this is the second mistake they make.
The Ātma is changeless; the six changes, all of them, belong to the body alone. Though the one who is born is one alone, he is like a drop of oil fallen on water. That person does not agree to live all alone. If there is a bond (Link) between your own happiness and the happiness of others, then happiness is there. Only the life that journeys from the place called ‘I’ to the place called ‘we’ is the highest life. Through the illumining power of a good intellect, man must come to know what is to be followed and what is not, what is ordained and how it is to be done, and set about such an unfolding. Man's happiness, Śānti and good fortune, all of them, and the welfare of the world as well, rest on his intellect alone. Through the Gāyatrī mantra, man prays to the Paramātma, whose very form is Consciousness, for this alone: to stir up the power of dhī, purify the intellect and make it grow.