suppose you pushed a magnet into a coil of wire. this induces a current in the wire due to a change in the magnetic field of the wire
but this current induces its own magnetic field - suppose this magnetic field acted to pull the magnet in even faster - then this scenario happens
clearly energy is being created for nothing here - so that violated conservation of energy. - therefore the induced current must
oppose the
change in magnetic field caused by the moving magnet.
basically the direction of the induced current is in a direction that induces a magnet field opposing the original change. - you can find the direction using the left hand or right hand rule, i cant rememberwhich :)
so the magnet goes through the coil normally :)