6:18 In this section on prayer, Paul first exhorts the Ephesians to always be in prayer. He says that they should be praying at all times. This prayer is to be done according to the Spirit. As they are living a life of prayer, they are to also be alert. Paul previously discussed that the schemes of the devil were multifaceted (6:11–12), so it is pertinent for believers to be aware and always ready for the spiritual opposition they are sure to face.