Tell the Truth, but tell it slant

Tell all the Truth but tell it slant-

Success in Circuit lies

Too bright for our infirm Delight

The Truth's superb surpriseAs Lightning to the Children eased

With explanation kind

The Truth must dazzle gradually

Or every man be blind-


From Google:
My interpretation of this poem is this:
To tell the outright truth is too much for people to handle. Surprising someone with the truth is like a child seeing lightning for the first time and trying to explain to them why it is the way it is. The truth has to be gradually told or the person or people that the truth is being told to will be shocked.
So to 'slant' the truth isn't to tell a lie but to tell the truth little by little.
-Anonymous