We don’t know who we are until we see what we can do.

The line suggests that identity is not primarily discovered through introspection or labels but through action under real conditions. “Who we are” emerges when we are tested—by responsibility, crisis, or opportunity—and our choices reveal capacities and values we may not have recognized. It also implies a dynamic self: character is partly made, not merely found, as we learn our limits and strengths by attempting difficult things. In a literary context, the sentiment aligns with narratives where protagonists come to self-knowledge through ordeal, emphasizing agency and lived experience over self-description.