What's a quote, that talk about Katniss volunteering as tribute for Prim, apart from, "I volunteer as tribute", in Chapter 2?

There must have been some mistake. This can’t be hap- pening. Prim was one slip of paper in thousands! Her chances of being chosen so remote that I’d not even bothered to worry about her. Hadn’t I done everything? Taken the tesserae, re- fused to let her do the same? One slip. One slip in thousands. The odds had been entirely in her favor. But it hadn’t mat- tered. Ch 2