(NOT THAT OLD PATTERN OF NEURAL ACTIVITY)
From the 17th Canto of Saundarananda, trans. Linda Covill
Then he entered the first level of meditation, in which passion and the tainted constituents of reality are absent. It consists of an initial and a sustained application of the mind to its object, is born of discernment, and is imbued with happiness and bliss.... He realized that the initial and sustained application of the mind... are not conducive to peace but make undulations in the mind. He decided to break away from them....
Then he gradually entered the second level of meditation, which has no initial or sustained application of the mind to its object. Born of concentration (samaadhi-jam) and calm due to mental one-pointedness, it is joyfully blissful and endowed with inner delight. And in reaching that level of meditation in which the mind is silent, he experienced a profound joy that he had never experienced before. But in that joy too, he noticed a flaw, just as he had with regard to thoughts. For he who takes profound joy in anything will also find unsatisfactoriness in it.
He attained the third level of meditation... bliss greater than any other bliss.... But since he considered the highest to be peaceful and without fluctuation, he detected a flaw even in meditation at this level -- that his mind fluctuated continuously due to modulations in the working of bliss.
Then, because he had given up... he attained the fourth level of meditation.
With the support of the fourth level of meditation, he made up his mind to win the worthy state, as a king joins with a mighty and noble ally when he wishes to conquer unconquered territories.