1 Thessalonians 5:4-5
But you, brethren, are not in darkness, so that this Day should overtake you as a thief. You are all sons of light and sons of the day. We are not of the night nor of darkness.
Biblically, darkness symbolises spiritual ignorance, sinfulness, blindness and separation from God. By definition, Christians have been delivered from the power of darkness and translated into the kingdom of His dear Son (Col. 1:13). Therefore, as sons of light, true Christians should not be overtaken by the Rapture “as a thief”. When we let the Scriptures and the Spirit inform and transform us, we’ll always be ready. (See also Lu 21:11; Ep 1:17-19; John 15:4; Gal 5:16).