View on Einstein on the determinism of nature

Max Born, in his book Physics in my generation, relates Einstein's view on the determinism of nature:

"His conviction seems always to have been, and still is today, that the ultimate laws of nature are causal and deterministic, that probability is used to cover our ignorance if we have to do with numerous particles, and that only the vastness of this ignorance pushes statistics into the forefront."

Max Born, Physics in my generation, Einstein's statistical theories.

Now, nobody says that Einstein was always right. Indeed, the development of quantum mechanics went in the opposite direction to Einstein's view.