two movements to coexist in a single locus at the same time; hence two sounds cannot coexist, nor can two letters.

Movements are spatial states, and spatial states are like colours: just as two different colours cannot coexist in a single locus at the same time, neither can two different spatial states.

The meanings of speech are different. These include a demand, which entails love for what is commanded and hatred for what is forbidden, and a statement, which entails knowledge and belief concerning what is reported. Although these are distinct realities, nothing prevents their coexistence. Commanding one thing does not conflict with prohibiting another or knowing a third. Their incompatibility is therefore not intrinsic, but arises from the servant’s inability to combine them.

Things thus fall into three categories:

Those whose coexistence is intrinsically impossible, such as different colours.

Those whose coexistence is possible and which do coexist, such as knowledge, will, and power, or taste, colour, and smell.

Those which some living beings are unable to combine, such as many acts of will and many beliefs at the same time. There is no incompatibility between their realities that prevents their coexistence; rather, the servant is unable to combine them, just as there is nothing impossible about his performing an action with his tongue and with his hand