Who are you singing to when you sing? This verse suggests it's a communal act with an inward focus.
The phrase 'speaking to yourselves' (or 'one another') is crucial here. It points to the communal aspect of worship, where believers encourage and build each other up through song. This isn't just for a performance; it's a mutual exchange of spiritual encouragement.
But the emphasis quickly shifts inward: 'singing and making melody in your heart.' This tells us that external singing, no matter how beautiful, is incomplete without genuine heart engagement. It's the inner reality—the praise, thanksgiving, and devotion—that truly matters to God. Your heart is the instrument that makes the singing spiritual.