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President Obama amending the Bill of Rights
Truth - reality - is all that there is. Everything real is what it is, and anything else is pretense; half-truths as well as direct lies spun to deceive others do not exist. The meaning of the truth will set you free is that only reality and what's factual actually exist. Lies, falsehood, cheating, and deception are all not real.
Since, presumably, you wish to improve your situation and move on from where you are, how can anything but the truth help? To the extent that you choose rely on what is not true, you deceive yourself. But there's more power in truth than deceit, only decisions based on truth give you the freedom and the direction to get to where you really want to be.
Why do so many engage in deception and misinformation? It's simple, they're gullible. Their self-sabotage mechanism tells them that Nazi mass-murderer Adolf Hitler's strategy - the end justifies the means - along with power, saving face, dishonest prosperity gained at the expense of other people, and position in society are all more important that the old-fashioned virtues of honor and principle.
But they know the truth about their behavior in their hearts, no matter how much they may pretend. Since the bad and the good conflict internally, choosing honesty and integrity will eliminate the resulting stress. How can you feel good about yourself when your self-inflicted internal stress and conflict tear you apart?