Buddha exposed the all truth and teach us like the timeless teaching. How can he found the truth and solution, because his mind is fresh not like our. As his mind was fresh, his meditation also true. We often can't control our mind as our meditation not successful but we can learn from Buddha. He is still alive in our heart and his accents is the key to control our mind as we keep our mind fresh and our meditation also be true.
We all have the potential to become Buddha or at least enlightened, a bodhisatta, or an arhat...the teachings are timeless because they address what we all hold in common, grasping at was is not self as self, grasping what seems to bring lasting happiness but is in flux, running away from what we don't like...