Sruti consists essentially of the Vedas and the agama, preserved initially through oral tradition and eventually written down in Sanskrit. Among the many sacred books of the Hindus, these two bodies of knowledge are held in the highest esteem. For countless centuries shruti has been the basis of philosophical discussion, study and commentary, and this attention has given rise to countless schools of thought. It is also the subject of deep study and meditation, to realize the wisdom of the ancients within oneself.