Pablo Picasso was wise enough to see through the mighty power of human imagination. But he failed to mention that perceived reality is different from the actual reality. The purpose of human beings on this planet is to align the actual reality with the perceived reality that the frontal cortex and the fully advanced brain is able to conjure up.
Reality is what is there in existence. A human being having the power of imagination can create many realities in his imagination. For him, the truth is what he perceives it to be. He can believe in something as a fact (truth in his mind) while it is not there in reality. Aligning and Positioning himself with reality is the objective of a human being.