Value of knowledge is a matter of perspective.
What you value as useful knowledge, someone else might not.

"Power" from knowledge comes under many forms. Such as; Social (power), recognition, control, manipulation... reaching any type of personal gain or need by pure interest OR for the good of all...
The essence in having "Power" from knowledge often means that knowledge can potentially provide you the right support to realise your "goal(s)/dream(s)".

Information/Knowledge is a currency in an unregulated market.

Knowledge also has power in the sense that it gives you some steps ahead from everyone else.

Knowledge definetly shifts our focus.
It affects us by waking our awareness of certain things that we haven't thought of. Some knowledge might help our actions (decision-making) in a wiser way... although "processing knowledge"depends very much in who's hands gets into. If you give a certain degree of knowledge to someone that has the brains of a monkey, why not giving an atomic bomb to one and let's see what's going to happen.

Blockchain for ex; it is a "powerful" tool that has the potential to shift all current systems.. it is open source, everyone can access it. everyone can exploit it. it depends how. put them in the hands of gouvernments, banks, greedy brainless people, business corporations... what do you think it'll come out of it.. or if gouvernment had previously discovered it 1st...

Bitcoin/Blockchain has alot of "power". It all depends of "the" person's perspective.

Technology can do beautiful things but as beautiful it can be, it can be also as uggly.