PaulM50, no one need tell you, you just said it yourself because deep inside that empty place you feel, tells you the truth.
Truth by it's very nature is singular. Truth is found in only one person, one place, Christ Jesus. We as humans, and sinners are incapable of being truthful 100% of the time. We as humans with our limited capacity are unable to see the truth 100% of the time. We accept theories as truth (evolution for example), we accept lies as truth, and we seek the truth where it will never be found, from within. He tells us "lean not on your own understanding", yet even Christians fall for all the clever humanistic slogans, and the "brilliant" words spoken by philosophers. Most often if we look at what they say, we can find it was said thousands of years ago, and revealed to us by God's word, the Bible.