“The material called iron or steel I hold in high respect. What it can do in arriving at a form economically, no other material can do... What associations it possesses are those of this century: power, structure, movement, progress, suspension, destruction, brutality.”

“Some asteroids are made of an iron-nickel-cobalt alloy. Others contain carbon. Combine those and you have steel alloy. A solar furnace can heat the mix to the point you can cast or roll it to shape. So structural parts are about the easiest thing to do.”

“Power is not a material possession that can be given, it is the ability to act. Power must be taken, it is never given.”

“PROUN is understood as the creative construction of form (based on the mastery of space) assisted by economic construction of the applied material. The goal of PROUN is progressive movement on the way to concrete creation, and not the substantiation, explanation, or promotion of life.”

“What is conserved, in modern physics, is not any particular substance or material but only much more abstract entities such as energy, momentum, and electric charge. The permanent aspects of reality are not particular materials or structures but rather the possible forms of structures and the rules for their transformation.”

“If gold rusts, what then can iron do?”

“Wealth, for the purposes of economic study, is confined to those values attaching to material objects through the action of man, which values can be exchanged /or other values.”

“If being an egomaniac means I believe in what I do and in my art or music, then in that respect you can call me that… I believe in what I do, and I'll say it.”

“Stone is the only true material for the sculptor. All others, tin, iron bars, tin cans and coiled springs are merely poor substitutes”

“What you don't do can be a destructive force.”