A person can grow only as much as his horizon allows.
The wisdom here isn't merely that ambition requires big dreams—it's that our actual capacity to change depends on what we can *see* is possible. Someone raised in poverty who has never met a doctor, engineer, or business owner quite literally cannot imagine becoming one, no matter how talented. That invisible boundary becomes more real than any law. A young person today who discovers online that others their age have built companies or mastered languages they thought impossible often finds themselves suddenly capable of things they'd dismissed as fantasy mere months before—the horizon shifted, and so did their growth.