add my text to textarea

[SoshoMarcin]

Hello,
I'm creating a new module. In configuration (back office) I'm display a form with a textarea and with setting

'autoload_rte' => true (user can easily format the text)

After saving the text goes to the database. And now my question: how the text

$text_from-mysql = 'some text'; // text from base

display in textarea?
I was looking for some settings like 'value' or 'default_value' but in textarea it does not work.