Commentaries:
In the Parable of the Light recorded in Matthew 5:14-16 (found also in Mark 4:21; Luke 8:16-17; 11:33-36), Jesus Christ uses two figures of speech to express the responsibility of true Christians to influence the world: "a city . . . on a hill" and "a lamp . . . on a lampstand."
Many Judean cities were founded on the summits or sides of mountains, and travelers could see them from afar. Perhaps Jesus pointed to such a city, telling His disciples that they were like it. The city built on an important location can be seen by many eyes over a wide area, representing a disciple's far-ranging and widespread exposure to others.
Jesus' illustration of a shining lamp illuminating the home suggests a disciple's more intimate influence. By design, a Christian's actions cannot be hidden from the eyes of either our families or the world at large. This being the case, he must live a righteous, holy, humble, and pure life, letting his "light so shine before men [and thus] . . . glorify your Father in heaven."
Martin G. Collins
Parable of the Light
Other Forerunner Commentary entries containing Luke 8:17:
Matthew 5:14-16
Mark 4:21
Luke 8:16-17
Luke 11:33-36
Luke 12:1-7
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