Peace of Mind (Mir u duši, 1929) is a booklet containing the lecture Ivana Brlić-Mažuranić gave on Peace Day 1928, in Slavonski Brod. The text uses an allegory of a bird that refuses to leave her nest despite the noise and imminent danger of war to express the author's view on duty as the natural order of things. The allegory is a symbolical confirmation of Ivana's view of human duty and responsibility as the natural order of things.

Dubravka Zima, 2013