Difference between Redirect en load-view

[eluser]Unknown[/eluser]
After a form submit, and the data is wrong.. what's the difference between using $this->load->view('bla') or redirect('blog/post')

Here is my full code for now..

Code:

function comment($id){
  $this->load->library('form_validation');
  $this->form_validation->set_rules('name','Name','trim|required');
  $this->form_validation->set_rules('email','Email','trim|required|valid_email');
  $this->form_validation->set_rules('comment','Comment','required');

  if($this->form_validation->run() == FALSE){
   redirect('blog/post/'.$id);
  }

Thanks!