A good source book is The Jesus Mysteries, authored by two British archeologists named Freke and Gandy. You can find it on Amazon. They are experts on the languages and cultures of the ancient world, and went to original sources for references to Jesus and to the stories and quotes attributed to him. Their scholarship is rigorous, and about a third of the book is references and footnotes. What they found surprised even them: all of the Jesus stories (born of a virgin, sermon on the mount, riding a donkey to town, water to wine, etc.) existed well before the Jesus myth, and none of the dozen or more contemporary historians of his time (including the Romans, who kept records of their crucifixions) mentions anyone recognizable as Jesus. Check it out. But also ask, who cares?
Even if the man did exist, he left no writings of his own, so we can't read any reliable account of whatever he may have said.