Nnewton's third law

[kasheee]

“No force can be exerted without an equal and opposing force(even if some of that force causes an object to accelerate”(extracted from aphysics book).
Could you apply the above statement to an example I made upbelow so I can understand the concept please. Use a diagram is you want to. Thanks.
I am pushing a stationary block on a horizontal surface with 30N and static frictionmaximum is 25N.

 

[HallsofIvy]

You certainly cannot push on that block without feeling some pressure against your hands and arms can you? If you are pushing against the block with force of 30N you will certainly feel the block pressing back against your hands with equal force, 30N. As far as the block is concerned, 25 N of the force you apply will go to overcome the friction force and the other 5 N to accelerating it at acceleration 5 N divided by the mass of the block.