Her motivation was a subtle, subconscious thing. At first. It was only a silly idea , a what-if. Brightstar thought she'd brushed it aside, until her deputy's mate succumbed to Greencough; her second-in-command was suddenly useless, lost in his grief. Suddenly it was more than idea. It seemed like an aspiration. She'd seen first-hand her Clan's weakness when it came to love, although it was an affliction she hadn't suffered. Brightstar had always curled up with her ambitions at night, never a resident tom. That made it easier, to turn her back on love. It only fuelled her motivation, all the stronger.
I had absolutely no idea what to do for this one. I was sitting there muttering, "Motivation, motivation," and hating my prompt-picking skills. Then I made a snack and had a brainwave.