The implications seem to be that we are not to complain about adversity. The adversity we face is intentional. It has purpose. God is about molding us into the image of His son and into His instrument to accomplish that for which He prepared us, since the foundation of the world.
James 1:2 - 4 (here @ Bible Gateway) supports this, as do Romans 5:3 – 5 (here @ Bible Gateway), Ephesians 2:10 (here @ Bible Gateway), and Hebrews 12:4 – 13 (here @ Bible Gateway).
I admit that at times I complain. I do not understand what God is doing, so I complain. That is when I have to be reminded to trust Him and not what I see or experience.