For your reading pleasure…
“Yet there were others and it is here that the word acquires its pregnant meaning-who are called by Jesus and follow Him in the sense that they accompany Him wholeheartedly and constantly, sharing His life and destiny at the expense of all other engagements and commitments, attaching themselves to Him, placing themselves in His service, and thus showing that they are qualified to be His disciples…”
Karl Barth Church Dogmatics, vol 4.2