ALWAYS the truth. :/ Lying is terrible and even if you're trying not to hurt someone by lying its still wrong, it destroys trust and and can destroy friendships/relationships. If you've ever made a mistake its always best to own up to it, though its better to not do wrong in the first place. Lying treats those who are lied to as a means to achieve the liar's purpose, rather than as a valuable end in themselves. Lying to someone can make them feel badly treated - deceived and manipulated, and regarded as a person who doesn't deserve the truth, as well as depending on the situation can be quite damaging and make a person question their self worth, as well as becoming untrusting towards others.

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"O what a tangled web we weave when first we practice to deceive. -Sir Walter Scott, Marmion"