Yes, that is one hundred percent true. There are two ways of answering this question:
First I am going to take an objective look at this question. The natural answer is that there exists a possibility for everything in this universe. That means, (theoretically) according to the modern science, there is a way for even the impossible to happen. No matter the minuteness of the probability of something happening, the fact remains that it can happen.
Second I am going to take subjective look at this question from the context of human psychology. In the limited scope of our own little world, we humans have the ability to do and achieve the impossible. Please remember that I am not talking about becoming the masters of the universe - I am talking about mastering oneself.