By purity Buddha always means Innocence. ~OSHO~

You will have to learn the ways of purity. By purity Buddha always means innocence, the unburdened consciousness -- unburdened of knowledge, unburdened of scholarship, Vedas, Bibles, Korans. They all burden you, they give you a false sense of knowing; and the false sense of knowing becomes the barrier in knowing. If you really want to become a knower you will have to drop all knowledge, you will first have to become ignorant. That is purity: a mind without any content, a mind like a child's, a pure mind.

And detachment.... By detachment Buddha means, don't think of yourself as the body. If you think yourself to be the body you cannot undertake this adventure of finding yourself, because you have already become identified with your body. Don't be identified with the mind either. If you think that you know already, then you will remain confined to whatsoever you are.
Remain open: that is detachment. Don't say that "I am the body, I am the mind." Say that "I know nothing. The body is there, the mind is there, but I don't know who I am. And certainly I am not my body."

As you go deeper into innocence you will be able to see that if your hand is cut off, your consciousness is not reduced that much -- it remains the same. Your leg can be cut off; your body is no longer the same, but your consciousness remains the same, it is not reduced. If your mind changes -- and mind continuously changes -- your consciousness does not change with your mind; it is an unchanging phenomenon. It is the only unchanging factor in existence; everything else is a flux. Only the witness remains permanent, absolutely permanent. It is eternal. Mind is time and you are timelessness.

But for that you will have to learn the ways of detachment and you will have to release great vigor, great enthusiasm and great energy. Ordinarily your energy is being wasted in unnecessary pursuits. You will have to cut your unnecessary pursuits. That is true sannyas.

Sannyas does not mean renouncing life but renouncing the unnecessary life. Just look, take note, watch, analyze, observe, and conclude how many things you are doing which are unnecessary -- how many things you go on doing because you have become accustomed to doing them. You have never thought about them, whether they are necessary or not. How much do you talk with people? Is it all necessary?

If you start watching you will be surprised: you will become more telegraphic, in words, in actions, in your pursuits. You will become very choosy. And you will be surprised that almost ninety percent of your activity was futile; its only function was to keep you occupied. Its only function was a slow suicide. It was poisoning you. When this ninety percent of your unnecessary activity is reduced, great energy becomes available to you. And only with such energy, such detachment and such purity can you create the right space in which light is seen.

Source - Osho Book "The Dhammapada, Vol7"