It is the hallmark of any deep truth that its negation is also a deep truth.
Prediction is difficult, especially the future.
Einstein, stop telling God what to do!
Prediction is very difficult, especially if it's about the future.
Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.
And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.