He that loveth father or mother ... - The meaning of this is clear. Christ must be loved supremely, or he is not loved at all. If we are not willing to give up all earthly possessions, and forsake all earthly friends, and if we do not obey him rather than all others, we have no true attachment to him.
Is not worthy of me - Is not appropriate to be regarded as a follower of me, or is not a Christian.