Live by Definition 1 of 3Pro Tip 1/3Personal Principles This phrase often tells about personal values that shape behavior. Marco lives by the motto, 'Always be kind.' Pro Tip 2/3Moral Standards It's used to express adherence to moral or ethical standards. She lives by a strict ethical code. Pro Tip 3/3Guiding Principles It can show the guiding principles of a larger community or group. The organization lives by the principle of transparency.