conky displays whatever you have in your $HOME/.conkyrc file. You can add arbirtary text there. Alternatively, you can have it import and display the contents of another file. For example, if you have the text in question in ~/foo.txt, you can add this line to your .conkyrc:

 ${exec cat ~/foo.txt}   

That will run cat ~/foo.txt and will display the contents of the file in your conky. If the contents of the file can change and you want the changes to be updated in conky, use this instead:

 ${execi 3 cat ~/foo.txt}   

That will run cat ~/foo.txt every 3 seconds, updating the text displayed by conky.