To come to know that nothing is good, nothing is bad, is a turning point; it is a conversion. You start looking in; the outside reality loses meaning. The social reality is a fiction, a beautiful drama; you can participate in it, but then you don't take it seriously. It is just a role to be played; play it as beautifully, as efficiently, as possible. But don't take it seriously, it has nothing of the ultimate in it.
The ultimate is the inner; the indivisible soul knows it. And, to come to that soul, this is a good turning-point.
Allow me an interpretation -
What Osho is telling us is to reject dogmas and theoritical understanding of the world.
This is a very scientific approach because unless we look at things as they are no scientific progress is possible. E.g for years doctors held on to the belief that ulcers were heriditary that no bacteria could grow in the highly acidic environment of the stomach. It was only when what was considered right till then was rejected that the ulcer causing bacteria was discovered and a new (very effective cure) for ulcers was found.
Our minds are clouded by dogmas and truths half understood. This really is the result of our social existence. Where all kinds of half baked ideas and understandings are thrown at us daily. That's why it is so important that we keep good (truthful) company. That's why being with the Guru and in the company of the Buddha is so important.