In plain words
Today this chariot is not entering this right path. Not only do we drive it along some crooked path and fall into tangles; we are also ruining the parts in it, the parts in the car. Some 80 parts of this are spoiling these chariots. Of the 20 parts that remain, 15 parts, like cars set out in a showroom, decorate themselves nicely, eat well, and, not knowing what their life is, sink into wrong conduct and are merely enjoying a pleasure lower than that of beasts. If a car, born to give travellers fitting help and settled in that form, is not used in any work or along any helpful way, we may regard it as nothing but a lump of iron.
One who lives in the world must first become a man; the one who keeps praising all the misdeeds of others, he is the fool; to learn Brahmavidyā and discover the spiritual here: this itself is the road to Rājayoga, this is the word the Śrutis speak.
So, believing the body to be a chariot, we should keep as our aim only this: to see that no trouble comes to the parts in that chariot; and for all the rest, too, we must go on with our life's journey in what reaches that very principle of Brahman from which we set out. With just such kings of pleasure in view, Śaṅkara's disciples went on giving good teachings that lead to such renunciation, to sacred yoga and to the sacred vision.
“The body is made of the five elements; the body must fall, always”: so, holding it very necessary that we keep that very principle of the indweller as our aim, take the body as a support and carry on the journey of our life, Śaṅkara's disciples put such questions to themselves as ‘Who are friends, who are enemies, who are sons, who are kinsmen?’, stood man up, sifted him hard and set about achieving it: great and sacred souls, Śaṅkara's disciples.