The body of a creature is called the car. The vital principle is the driver of that car. The senses are the horses. Our acts and the understanding are the traces.
रथः शरीरं भूतानां सत्त्वमाहुस्तु सारथिम्। इन्द्रियाणि हयानाहुः कर्मबुद्धिस्तु रश्मयः॥