On a windswept coast in the early days of wireless communication, Guglielmo Marconi stood beside a crude wooden mast and pressed a small metal key. A spark leapt between two brass knobs, sharp and bright. That spark released invisible waves into the air. Waves that carried a message across miles of open space. No wire connected sender and receiver. And yet, far away, another instrument responded with a faint click.

The spark sent out a signal. The air was already full of all kinds of—natural noise, electrical hums, other broadcasts. The receiver was set to a specific frequency, and it reacted only to waves that matched that setting. When the tuning lined up, the message came through clearly. When the tuning was off, the waves were still there, but the device didn’t register them.

Yogi Ramacharaka teaches that thought works in the same way. In his view, thoughts are living vibrations, radiant and persistent, moving through the mental plane. They travel outward and linger, gathering with currents of similar tone. “We attract the thoughts that resemble our own,” he writes.

The mind, like Marconi’s receiver, is constantly surrounded by mental vibrations. Courage, fear, ambition, and doubt move through the atmosphere. And we mostly pick up the kinds of thoughts we’re used to thinking.

When you dwell on confidence and strength, you tune yourself to similar vibrations. When you indulge in fear or discouragement, you open yourself to reinforcing waves of the same kind. When you focus on what you don’t have, you start seeing more things you’re missing. When you look for what’s going right, you notice small wins and kind people. Like attracts like in the thought-world.

Marconi proved that the air is full of unseen messages. The yogi teaches that the mind is likewise immersed in invisible currents. By changing your mental attunement, you change what you receive… and, ultimately, what you become.