Error in sending email in laravel 5.4

I am trying to send email using laravel 5.4. It completely runs if I do not use any variable. But when I set veritable $msg it show me error. How can I fix that? Thanks in advance.

public function index()
{

   $msg= "This is an email";

   Mail::send(['text'=>$msg],['name','mithun'],function($message){
    $message -> to('m.r.mithun.94@gmail.com','to asdf')->subject('test');
    $message -> from('mdmithun250@gmail.com','mithun');
   });       
}

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