In this passage, Paul is addressing the Corinthian church about the use of spiritual gifts, particularly speaking in tongues. He stresses the importance of not only being spiritually expressive but also ensuring that one's worship is intelligible and edifying to others. Praying and singing with the spirit refers to being led by the Holy Spirit, which can involve speaking in tongues or other forms of spiritual expression. However, Paul insists that this should not be done without understanding.
Understanding implies that the worshiper knows what they are saying and that it can be understood by others, thus benefiting the whole congregation. This dual approach ensures that worship is not only an emotional experience but also an intellectual one, fostering both personal edification and communal growth. By advocating for this balance, Paul encourages believers to engage fully in their spiritual practices, ensuring that their worship is both sincere and comprehensible, thus enhancing their relationship with God and with each other.