My spirit that is upon thee, and my words, &c.] Because teaching becometh profitable by the cooperation of the Spirit. 2 Corinthians 3:6. he joyneth both together, John 6:36. and promiseth the continuance of both unto his Church, for ever, Chap. 30. 20. & 49. 2. & 51. 16. Matthew 28:40. Joh. 14. 16, 17. of thy seed] The faithfull: the seed according to the promise, Rom. 9. 6, - 8. Galatians 3:16; Galatians 3:29.