Language, and even maths, are ultimately clumsy tools with which to model and convey our experiences. They illustrate patterns of reality with some accuracy, however when it comes to conceptualising the substance of these patterns, the thread with which they’re woven, the fundamental limitation of models surface.
Thought isn’t controlled, only witnessed. We perceive it through the sense which we identify most intimately with; the mind. In the same way that an eye perceives light, the mind perceives thoughts.