Once you have provided the header information, you can insert the text of the citation itself:

The field for the citation text
Note that you can insert text in non-Latin alphabets:

Text in a non-Latin alphabet
For more information on this capability, see support for Unicode and non-Latin characters.
In the same "notecard", you can store a translation of the text, by clicking on the tab labeled "Translation":

The tab for storing the text's translation
Finally, the citation record can contain commentaries on the cited text.

A commentary on a text
These commentaries can be exported later, either in PDF or RTF (Word) format, as an aid in creating publications based on your own reflections on the texts you have read.