This is a collection of teachings and quotes of Sage Yajnavalkya from Upanishads
The senses are in the nature of hindrance only as long as they are not directed inward, towards the Atman. The eye cannot choose but see; and the ear cannot choose but hear. Similarly the mind.
Make the senses calm, make the mind almost blank; do not think of anything in particular, and then you will hear in your heart the voice of the infinite.
If you find it to be too hard a path, let the ear hear of the Atman, let the eye see that all this is the manifestation of the Atman and let the mind meditate uninterruptedly on the nature of the Atman. In this way, the scattered faculties are all coordinated and directed towards the Atman. That is the way. That will reveal to you that the knowledge of the Atman is superior to all else. The Atman is all in all. There is nothing in this world but the Self, the Atman.
Describing the root cause of fear, Yajnavalkya says: Where there are two, one sees another, one hears another, one welcomes another, one thinks of another, one knows another. But when the whole has become that Atman, who is seen by whom, who is to be heard by whom, who is to be welcomed by whom, who is to be known by whom?
As to all water, the one goal is the ocean; as to all touch, the skin is the one centre; as of all smell, the nose is the one centre; as to all taste, the tongue is the one goal; as of all form, the eyes are the one goal; as of all sounds, the ears are the one goal; as of all thought, the mind is the one goal; as of all knowledge, the heart is the one goal; as of all work, the hands are the one goal; as salt put into the sea-water melts away, and we cannot take it back, even so this Universal Being is eternally infinite; all knowledge is in Him.