Then learn to See! Connect to something greater than you—greater than anything you've ever known.

Stand up straight! Look brave!
(Stand up straight! Do not show fear!)
(In fact, the version with tìtstewnga' is grammatically correct. However, in the context in which Varang speaks it, the original version is justified, even if it bends the rules. She wants to say something sharp and punchy, with good rhythm. 'Ur fkivan tstew! is much stronger than 'Ur fkivan tìtstewnga'. And it's perfectly understandable.)

I know the word.
(implies you have a deeper understanding of the word's meaning)

That word is familiar to me.
(could merely state you're familiar with the word, in the sense that you've heard it before)

The fire will burn!
(Varang's chanting)