"I said further: “As the word of God is walled in with these books and pamphlets, so has God walled you in with reproofs, counsel, warnings, and encouragements. Here you are crying before God, in the anguish of your souls, for more light. I am authorized from God to tell you that not another ray of light through the Testimonies will shine upon your pathway, until you make a practical use of the light already given. The Lord has walled you about with light; but you have not appreciated the light; you have trampled upon it. While some have despised the light, others have neglected it, or followed it but indifferently. A few have set their hearts to obey the light which God has been pleased to give them. LS 199.2"
"And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead."
The EGW passage discusses the futility of expecting more light when existing light is neglected, which parallels the sentiment in Luke 16:31 that those who don't heed Moses and the prophets won't be persuaded even by a resurrection. Both emphasize the importance of heeding existing revelation.