Yes it is easy to see the distinctness of the persons of the trinity but the oneness is less easy to see and especially the distinctness and oneness at the same time.
But people aren't told in the Bible that they must be able to understand it.
When I look up synonyms for "distinct" I find more than one meaning for "distinct". When it is an adjective,, meaning "apparent" or "obvious", I do not find "separate" as a synonmy. When "distinct" is used as an adjective, meaning "different" "unconnected" I find "separate" as a synonym.
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When distinct is used of the persons in the trinity it means "apparent" or "obvious" as in, you can see that there are 3 different persons.
If we are not told we must be able to understand it, then why are people who don't believe in the Trinity Doctrine often labeled as a "heretic"?
Actually, both usages of distinct are adjectives - one meaning apparent, obvious (syn: definite, noticeable, recognizable, specific, unmistakable)
and the other meaning
different, unconnected (syn: discrete, disparate, dissimilar,
distinctive, divergent, diverse, offbeat, particular, peculiar,
separate, special, specific, unique, various)
You are using the meaning of #1 in connection with the word distinct and yet #2 has as a synonym "distinctive" so when speaking of distinct wouldn't it also mean distinctive?
And when you say "3
different persons", what exactly do you mean because that seems to contradict how you are implying the word "distinct"?
#1 different (adj) dissimilar, unlike (syn: disparate,
distinct, divergent, unalike, unlike, unsimilar)
#2 different (adj) various (assorted, diverse, various, varying)
#3 different (adj) not identical, other or distinct (another,
distinct, other, discrete,
separate)
#4 different (adj) unusual (bizarre, distinctive, extraordinary, offbeat, peculiar, rare, special, strange, unconventional, unique, unusual)