The Unbearable Lightness of Being Part 4, Chapter 19 Summary
Tereza leaves the bathroom. She wants to hear the engineer call out to her soul in a deep, rich voice. She feels that she will fall in love with him if he does.
He does indeed call out to her from the next room, but his voice, now separate from his tall stature, is thin and high-pitched, and it turns her off.
This saves her from temptation. She quickly dresses and leaves.