Current Direction vs. Potential Difference

[makino.sh]

Very simple question, but is it wrong to believe that current always points in the direction of decreasing potential difference?

 

[jtbell]

Why do you think it might be wrong?

 

[makino.sh]

From the textbook we use, it reads how in junction diodes resistance is low for currents in the direction of positive potential difference, and high for currents in the reverse, negative potential difference direction. Now I'm trying to figure out how a current can be pointed in the direction of positive potential difference.