As you sing your song, the lyrics must become your own communication.
Mean what you say phrase by phrase – use emotion.
Your phrasing should relate to your emotion and should be believable within the style of the music. Making your lyrics and emotions pop through a recording is important to coming up with your own unique style that is felt by listeners. This also comes back to comfort in the studio – not being nervous and doing what you can to avoid those nerves (like memorizing your songs, practicing beforehand, etc).