大毘盧遮那成佛經疏 2.63

2.63

The thirty-fourth: "What is the drum-beating mind? It is following the practice of this teaching [thinking]: 'I shall beat the drum of the Dharma.'" A drum can sound an alarm to sentient beings, bringing them to awakening. If a practitioner thinks: "Sentient beings sleep in the stupor of the long night; I shall master various unhindered eloquence to beat the great drum of the Dharma and awaken them," this too can obstruct the pure mind. Reflecting: "I must swiftly realize the dhāraṇī of immeasurable tongues and announce this universally to all assemblies with the wondrous sound of the celestial drum, without letting small worldly benefits obstruct this great matter of causation," serves as its antidote.