Socrates in Plato's Dialogues examines the meaning or definition of key ethical words: TRUE GOOD BEAUTIFUL JUST (and their contraries) as well as KNOW BELIEVE
All languages have words for these concepts
The puzzle is how even very young children come to understand the meanings of these words. A child very early on will say: That's not fair!
In acquiring language, we latch on to those words which match the states, feelings and sensations which exist before language, parts of our mental structure. The same is the case for words referring to emotions - the child
may feel sad long before it comes to know the word 'sad'.
As also is the case for words relating to emotions, the brain/body states which are
the essence of the recognition of what is good, what is true, what is just have their bodily expression in body-movement, body posture.
The structures of the gestures below are derived directly from the sound-structures
of each of the words (in a parallel way to the derivation of gestures for emotional words.