Mark 4:27 Commentary - Whedon's Commentary on the Old and New Testaments
27. Should sleep, and rise night and day That is, who sleep, night, and rise, day. He knoweth not how He knows what must be done by him in order that the process may take place, but the process itself is a secret to him. The plants grow while he sleeps. But if he were awake, nature nevertheless works in secret before his eyes.
Consult other comments:
Mark 4:27 - Abbott's Illustrated New Testament
Mark 4:27 - The Greek Testament
Mark 4:27 - Albert Barnes' Notes on the Bible
Mark 4:27 - The Cambridge Bible for Schools and Colleges
Mark 4:27 - Adam Clarke's Commentary and Critical Notes on the Bible
Mark 4:27 - Companion Bible Notes, Appendices and Graphics
Mark 4:27 - Ellicott's Commentary for English Readers (Old and New Testaments)
Mark 4:27 - The Expositor’s Greek Testament by Robertson
Mark 4:27 - Garner-Howes Baptist Commentary
Mark 4:27 - Geneva Bible Notes
Mark 4:27 - John Gill's Exposition of the Entire Bible
Mark 4:27 - Gnomon of the New Testament
Mark 4:27 - Henry Alford's Greek Testament
Mark 4:27 - Robertson's Word Pictures in the New Testament
Mark 4:27 - A Popular Commentary on the New Testament
Mark 4:27 - John Trapp's Complete Commentary (Old and New Testaments)
Mark 4:27 - The Treasury of Scripture Knowledge
Mark 4:27 - Vincent's Word Studies in the New Testament
Mark 4:27 - Whedon's Commentary on the Old and New Testaments
Whedon's Commentary on the Old and New Testaments

Daniel D. Whedon (1808-1885) was a prominent university professor, theologian, and author. He served as Professor of Ancient Languages at Wesleyan University in Connecticut; as Professor of Rhetoric at the University of Michigan; and as editor of the Methodist Quarterly Review from 1856 to1884. He authored numerous books including Commentary on the New Testament (New York: Carlton & Porter, 1860); Commentary on the Old Testament (New York: Nelson & Phillips, 1873); What is Arminianism? (Toronto: W. Briggs, 1879); and Essays, Reviews, and Discourses (New York: Phillips & Hunt, 1887).