The disciple is not above his master (ouk estin maqhth uper ton didaskalon). Literally, a learner (or pupil) is not above the teacher. Precisely so in Matthew 10:24 where "slave" is added with "lord." But here Luke adds: "But everyone when he is perfected shall be as his master" (kathrtismeno de pa estai w o didaskalo autou). The state of completion, perfect passive participle, is noted in kathrtismeno. The word is common for mending broken things or nets ( Matthew 4:21 ) or men ( Galatians 6:1 ). So it is a long process to get the pupil patched up to the plane of his teacher.