The - Four - Stages Poem by Dr. Antony Theodore

The four stages
or phases or
segments on
the line
(from the bottom
to the top) are as follows:
eikasia,
pistis,
dianoia,
and noêsis.

(Dianoia (Greek: διάνοια, ratio in Latin)is a term used by Plato for a type of thinking, specifically about mathematical and technical subjects. It is the capacity for, process of, or result of discursive thinking, in contrast with the immediate apprehension that is characteristic of noesis. In Aristotle, knowledge is further divided into the theoretical (episteme) , and the practical, which includes techne and phronesis.

In Greek mythology, Pistis /ˈpɪstɪs/ (Πίστις)was the personification of good faith, trust and reliability. In Christianity and in the New Testament, pistis is the word for "faith". The word is mentioned together with such other personifications as elpis (Hope) , sophrosyne (Prudence) , and the charites, who were all associated with honesty and harmony among people.[1]

The term eikasía (Ancient Greek: εἰκασία) , meaning imagination in Greek, was used by Plato to refer to a human way of dealing with appearances.[1] Particularly, it is identified as the lower subsection of the visible segment and represents images, which Plato described as "first shadows, then reflections in water and in all compacted, smooth, and shiny materials".[2] According to the philosopher, eikasia and pistis add up to doxa, which is concerned with genesis (becoming) .[3]

In Husserl's phenomenology, which is quite common, this pair of terms, derived from the Greek nous (mind) , designate respectively the real content, noesis, and the ideal content, noema, of an intentional act (an act of consciousness) . The noesis is the part of the act that gives it a particular sense or character (as in judging or perceiving something, loving or hating it, accepting or rejecting it, and so on) . This is real in the sense that it is actually part of what takes place in the consciousness (or psyche)of the subject of the act.
Ref. to Wickipedia) .