The Jewish leaders of the day were trying to appear to be holy('I will take a sacred oath!"),and trying to get people to believe them, but had no intention of keeping their oaths.Jesus was to "shake them up" so to speak, for He was talking to liars and hypocrites. Matthew 5: 33-37 were what was spoken by Jesus on taking and making oaths and not fulfilling it. Jesus said it would be better never to swear an oath at all than to use it like the Jewish leaders were, to sin.I believe God wants me to use my eyes and my oaths the right way, not to eliminate them completely. For a lawful oath consist in calling upon God, the occasion being of sufficient seriousness and importance, to witness the truth of what we affirm as true.Hence an oath is an act of supreme religious worship since it recongnizes the omnipresence, and omniscience, absolute justice and sovereignty of the Person whose august witness is invokes, and whose judgement is appealed to as final.  It hence follows that it is a sin equivalent to that of worshipping a false God if we swear by any other than the only true and living God; and a sin of idolatry if we swear by anything or place, although it may be associated with the true God.