The most powerful force under your control is the power of desire.
Everyone has them. And they're not some evil consequence of other people's choices. They're God-given and the motivation to which Jesus most often appeals.
But they are powerful.
If they go unmanaged, mismanaged, or get unruly, they are powerful enemies. People need AA and nicotine patches for a reason.
James put it this way: when desire has conceived (a.k.a. when it's unchecked and allowed to go its own way), it gives birth to sin, and sin, when fully grown, brings forth death. Did you catch that? Desire -> Sin -> Death.
What we do with them is no small thing.
But that's just me thinking thoughts...