The Twins, who represent Gemini, are frequently said to as having two distinct personalities.
When Gemini people can balance their two personalities and get them to complement each other and work well together, they perform at their best.
This is similar to The Lovers, who, despite being two distinct people, can become something bigger than themselves with love and cooperation.
However, The Lovers card also implies that this equilibrium is something a Gemini person needs to intentionally accomplish, as shown by the vigilant angel.
The Lovers don't have on any clothing. This represents Gemini's sincerity.
The Lovers card emphasizes that Gemini has the gift of free will as well. They can discern good from wrong when they are at their finest. They have the ability to make wise decisions because of their superpower.