used to imply that a person's natural abilities, talents, or character traits are inherited from their family or ancestry, and will become apparent in their behavior, actions, or achievements
used to imply that when people are drunk, they are more likely to reveal their true personalities, emotions, and thoughts that they might otherwise keep hidden when sober
used to suggest that a person's eyes can reveal their true emotions, feelings, or character, as they are a reflection of their innermost thoughts and emotions