Why do we not touch papers, books and people with the feet?

Why do we not touch papers, books and people with the feet?   To Indians, knowledge is sacred and divine. So it must be given respect at all times. Nowadays we separate subjects as sacred and secular. But in ancient India every subject - academic or spiritual - was considered divine and taught by the guru in the gurukula.   The custom of not stepping on educational tools is a frequent reminder of the high position accorded to knowledge in Indian culture. From an early age, this wisdom fosters in us a deep reverence for books and education. This is also the reason why we worship books, vehicles and instruments once a year on Saraswathi Pooja or Ayudha Pooja day, dedicated to the Goddess of Learning. In fact, each day before starting our studies, we pray:   Saraswati namasthubhyam Varade kaama roopini Vidyaarambham karishyaami Sidhirbhavatu me sadaa   O Goddess Saraswati, the giver of Boons and fulfiller of wishes, I prostrate to You before starting my studies. May you always fulfill me?   To touch another with the feet is considered an act of misdemeanor. Why is this so?   Man is regarded as the most beautiful, living breathing temple of the Lord! Therefore touching another with the feet is akin to disrespecting the divinity within him or her. This calls for an immediate apology, which is offered with reverence and humility.