See an excerpt from The Guardian of 11.7.2006:
An Italian lip-reader last night claimed to have deciphered the words Marco Materazzi said to Zinédine Zidane that provoked the French captain into butting him in the chest during Sunday's World Cup final, the great midfielder's final act before a red card ended his career in top-level football.
According to the BBC, Materazzi said, "I wish an ugly death to you and all your family," and then told Zidane to "go #@$% yourself".
Well, lip-reading is important to the extent language is used in communication. But, does our thought process involve the spoken languages like English and French ? How does a babe think before it learns its mother-tongue ? Let us recall Helen Keller who was both blind and deaf. She, as a child, had understood
water' as that wonderful cool something' before the day her instructor put her little hand under a small stream of water and very slowly wrote `w-a-t-e-r" on her palm.
The stupendous ability of human brain to encode and decode information (which is received in hundreds of units per second, through the senses and stored in billions of brain-cells called neurons)surpasses that of a computer. It is not necessary that the process involves spoken languages. The Creator, of course, can read the thoughts(and prayers) of a person even before they are given shape through spoken languages:
For the word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart(Hebrew 4:12).
But, what about the Devil? Has he been delegated such a faculty? It is a matter of debate. So, the answer to the question " Can Satan read lips ? " is : If God permits, Satan can read our thoughts even before they reach our lips.