Christ's supreme manifestation as King will come when he returns to judge the living and the dead.  Until then, we have to remain patient with his will for us.  Jesus uses his power to serve others and he hides his power in order to suffer for sin.  At times, we might naturally wish for him to establish his kingdom sooner, putting an end to evil and suffering.  But we should always trust in his plan for our holiness and redemption, which is that we follow the longer and slower path that he himself followed.