In the Brihad Aranyaka Upanishad it is said that the Vedas came out on the breath of God. Just like you are breathing without thinking, for God, this Vedic knowledge is as natural. Therefore, God gave the Vedic knowledge effortlessly, just like breathing. If God wants to bring out the Vedas through breathing, He can do that. For Him every sense can do the function of any another sense because He is beyond duality. He is Absolute so His senses are also absolute.
