To those given only to the body's frequencies, a thought is not a thing. Conceptually, even emotions are nebulous, troublesome and indefinite in size when the observer is glued to the heavier wavelength of optical, tactical, olfactory and other nerve-defined perceptions. She who sees clearly the wave and sweep of emotions may still find certain concepts nebulous, hard to pin down. The being who perceives thoughts as the dance of form in the universe will happily have the more solid forms of light, mass, energy, emotion, but will be able to sense a broad concept as a definite object, to be measured, admired like a shiny Caddy, appreciated like a Rodin work. To such a one, even aesthetics have their form and limit, their palpable frequencies.
Scope shifts with the freedom to perceive in comfort.
One person's anger, which could be an insufferable problem to him or his spouse, could to another being be a single tiny sparkle on the immense expanse of an evening sea, a small contributory to the problem of the human race's task here on Earth. By their limits you can Know them, or Unknow them as you prefer.