The Crucible is a story about the Salem witch trials it shows people being executed for a crime of witchcraft with no justification.
Nothing good ever comes from lying or deceiving someone.
"Oh Mary this is a black art to change your shape." (pg 115) Abigail and the other "witches" pretended to see Mary Warren as a bird trying to attack them. They wanted to courts to believe that Mary Warren was guilty of witchcraft.
"And he goes to save her, and , stuck two inches in the flesh of her belly, he draw a needle out." (pg 74) Abigail lied saying she was stabbed by a needle that Mary Warren stuck in a poppet in which she used witchcraft to stab Abigail.
"My husband is a goodly man, sir." (pg 113) Mary lies about the affair between Abigail and her husband to protect John but he had already confessed so she made herself look like a liar.
Lying won't get you anywhere in life, as you see in the crucible, if no one ever lied this could've all been avoided and so many innocent lives could've been saved. When you lie it only makes you look bad and starts bigger issues than if you were just honest with someone.