(mobile thoughts) Power & Knowledge

Ignoring Foucault's thoughts about power and knowledge for just a minute (because they are more subtle than I have the energy to parse right now), is this really true,
"The truth may set us free or it may not, but it remains truth all the same. The point in each case is the same: power can influence our motivation to achieve knowledge and can deflect us from such achievement, but it can play no constructive role in determining what knowledge is."

The salient point is that knowledge is true. This is a big point, but without becoming too skeptical about truth, and adopting something of a pragmatic view of truth, if meaning is created from power, doesn't this mean power has a constructive role in knowledge? On my view, power is _the_ determining factor in creating meaning.