John Chrysostom
God has ordained that He should be worshipped persistently, at both the start and the close of each day. The Psalmist desires that his prayer be akin to this offering, untainted by the impurities of the one presenting it, much like the incense that is pure and sacred (Psalm 140:2). Through this petition, he instructs us to present prayers that are both pure and pleasing. This reflects the truth, as sin is odious. This is why he expresses the foulness of sin, stating, "For my iniquities have exceeded my head; like a heavy burden, they weigh upon me" (Psalms 37:5). Just as incense is inherently good and aromatic, it becomes even more fragrant when ignited, so too is prayer inherently good but elevated and more pleasing when offered with fervent passion.
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When one's spirit serves as a censer, igniting a passionate fire within, the offering of prayer is transformed. Incense is not placed until the fire has been ignited and the coals are glowing; likewise, nurture your spirit with zeal before bringing forth your prayers. Just as a censer contains nothing impure but only fire and incense, your speech should also be devoid of any sinful utterance, filled instead with words of holiness and praise. Let your mouth become a censer, ensuring it does not harbor filth, for those who speak shameful and impure words defile themselves.