CL on 34gal Cube

thanks!
One file on their site has this quote which confuses me...

"Friction loss increases at an
increasing rate when either flow is increased or pipe is narrowed. The narrower the line the more
the pump has to work (think clogged ateries and your heart)."

this is a copy and pasted quote from their site, this quoted explanation tells me that if I put a ball valve on the output of the pump and restrict the flow(narrow the output pipe), the pump is going to have to work harder.... tell me if Im nutz???

Im very confused because this below, is also a quote from the same page on their site... I find it very contradicting!!!

4. If your pump is producing too much flow, you can reduce the flow by partially closing a
valve on the discharge line. Never restrict the inlet!!! Surprisingly, this will make the motor work
less and use less electricity!! This “valving back” simply causes the pump to operate further back
on its performance curve.

Let me know what you think???

I have used these pumps alot for about 8 years, I think they are great pumps, but I do find these quotes contradicting!