A central theme of the philosophy of Kashmir Shaivism is the highly esoteric principal known as spanda. Swami Lakshmanjoo tells us that the word 'spanda' means established stable movement. That is, it is movementless-movement, vibrationless-vibration. It is this secret, mysterious and yet essential principle that Swami Lakshmanjoo clarifies and elucidates in his revelation of the two texts dealing specifically with this principle, the Spanda Karika and the Spanda Sandoha.