Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
Leonardo da Vinci

Guilt upon the conscience, like rust upon iron, both defiles and consumes it, gnawing and creeping into it, as that does which at last eats out the very heart and substance of the metal.
Robert South

The unthankful heart... discovers no mercies; but let the thankful heart sweep through the day and, as the magnet finds the iron, so it will find, in every hour, some heavenly blessings!
Henry Ward Beecher

We wind a simple ring of iron with coils; we establish the connections to the generator, and with wonder and delight we note the effects of strange forces which we bring into play, which allow us to transform, to transmit and direct energy at will.
Nikola Tesla

A sense is what has the power of receiving into itself the sensible forms of things without the matter, in the way in which a piece of wax takes on the impress of a signet-ring without the iron or gold.
Aristotle

Stone walls confine a tinker; cold iron binds a witch; but a musician's music can never be fettered, for it lives first in her heart and mind.
Charles de Lint

Many of us are in are in our own prisons that aren't made of iron bars.
Hill Harper

We are made out of stardust. The iron in the hemoglobin molecules in the blood in your right hand came from a star that blew up 8 billion years ago. The iron in your left hand came from another star.
Jill Tarter