This past month's Life Word Prompt at Paper Traders was "Be Truthful" (and use a pocket)
My first thought was the verse from John 8:32 -"and the truth shall set you free"
Here are some other great quotes about truth:
The worst thing about being lied to is knowing you’re not worth the truth. Unknown
If you tell the truth, you don't have to remember anything. Mark Twain
Tell the truth, or someone will tell it for you. Stephanie Klein
If you do not tell the truth about yourself you cannot tell it about other people. Virginia Wolf
Never be afraid to raise your voice for honesty and truth and compassion against injustice and lying and greed. If people all over the world...would do this, it would change the earth.
Truth never damages a cause that is just. Gandhi
Truth is like the sun. You can shut it out for a time, but it ain't going away. Elvis
Time is precious, but truth is more precious than time. Disraeli
The high-minded man must care more for the truth than for what people think. Aristotle