Revelation 9:1And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
2 And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.
"This is why Paul so fervently wrote to the saints in Corinth, saying, “Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding BE MEN” (I Cor. 14:20). Paul prayed for the Ephesian brethren to this end: “The eyes of your understanding being enlightened; that ye may know (by understanding) what is the hope of His calling, and what are the riches of the glory of His inheritance in the saints, and what is the exceeding greatness of His power to us-ward who believe, according to the working of His mighty power, which He wrought in Christ when He raised Him from the dead, and set Him at His own right hand in the heavenly places” (Eph. 1:18-20). And again, “Wherefore be ye not unwise, but understanding what the will of the Lord is”(Eph. 5:17). To the Colossians Paul wrote, “For this cause we also, since the day we heard of it, do not cease to pray for you, and to desire that ye might be filled with the knowledge of His will in all wisdom and spiritual understanding” (Col. 1:9-10)."