She thought the careful sister was the harmless sister.

She had it exactly backwards.

The reckless gambler who wagers a house at a poker table is not the strong one; she is the one who will lose everything and take others down with her.

The careful woman who reads every clause and keeps every record and never signs what she has not verified is not the weak one; she is the one who, when the reckless gambler finally comes for what she loves, will be ready.

My whole life, my sister had underestimated my carefulness.