Jesus said a lot of things, but he lacked the 2000 years of tradition, the writings of Aquinas and Augustine and the Catechism, so we have to take what He said with a grain of salt, view it through the stained glass windows of the Infallible Church and follow the teachings of the Church, regardless of what Jesus may have taught.  To do otherwise sola scriptura and could lead us to grave errors, like believing Bishops are mere humans who all too often act purely in their best interest and without regard to rules of basic decency.  And we can't have that, can we?  After all, when Jesus crowned Peter the first Pope, He clearly intended we devote our allegiance to the Church He established in Rome, and the Rituals, Rites, Rules, Traditions, and Habits thereof.  It's best to just do what the Bishops tell use to do, rather than trying to think for ourselves.  It's what Jesus would have wanted, if He'd had the guidance of the above-referenced sources.