What is the only thing Lina never questioned?

From the text:

“Was it harder to die, or harder to be the one who survived? I was sixteen, an orphan in Siberia, but I knew. It was the one thing I never questioned. I wanted to live. I wanted to see my brother grow up. I wanted to see Joana. I wanted to smell the lily of the valley on the breeze beneath my window. I wanted to paint in the fields. I wanted to see Andrius with my drawings. There were only two possible outcomes in Siberia. Success meant survival. Failure meant death. I wanted life. I wanted to survive.”