self-revelation

[ self-rev-uh-ley-shuh n, self- ]

/ ˈsɛlfˌrɛv əˈleɪ ʃən, ˌsɛlf- /

disclosure of one's private feelings, thoughts, etc., especially when unintentional.

Origin of self-revelation

First recorded in 1850–55

And here is a lovely bit of self-revelation made to her betrothed several months before they were wedded.

William Lloyd Garrison |Archibald H. Grimke
Nowhere else can there be found art criticism equal to this self-revelation of the artist who is called “the faultless painter.”

Browning and the Dramatic Monologue |S. S. Curry
There was something in Margaret Brent's manner which did not invite, much as it justified, self-revelation.

Sir Christopher |Maud Wilder Goodwin
The past also crumbled to nothingness before this shock of self-revelation.

A Question of Marriage |Mrs. George de Horne Vaizey

So the self-revelation of this young egotist went on and on until sleep laid a finger on her lips.

The Cricket |Marjorie Cooke