Truth is important to God. We ally ourselves with him when we lie. We have a tendency to be deluded. Augustine took an absolutist position. One never errs more safely than when one errs by too much loving the truth.
Some lies are understandable, some are worse than others, but all lies are wrong.
How people lie. We lie to other people. Lie not to hurt others, but protect ourselves. It often hurts others in the end. Most popular kind of lie.