Meaning of Alexander Pope's quote?

Question

What can the meaning of this epigram by Pope be? "All nature is but art, unknown to thee; All chance, direction, which tho canst not see; All discord, harmon not understood; All partial evil, universal good; And spite of pride, in erring reason's spite, One truth is clear, Whatever is, is right."

Answer 1

do not bother looking for what is wrong, assume everything is right.

Answer 2

I've done a line by line paraphrase, I hope it is helpful.
"All nature is but art, unknown to thee;You do not appreciate what you see for its beauty.
All chance, direction, which tho canst not see;There is no coincidence , no luck; all things are destined.
All discord, harmony not understood;In the total scheme of things; all things fall together and harmony exists.
All partial evil, universal good;There is some good in what is perceived as evil and evil adds its part to the universal good.
And spite of pride, in erring reason's spite,
One truth is clear, Whatever is, is right." No matter how we want it to be, no matter how right we may think our way is;there is only one truth; It is what it is!

The basic message:
Don't question the nature of life, it is inexplicable; it is what it is.