維摩經玄疏 6.104

6.104

第四、約觀心者，下文云「隨其心淨，即佛國淨」，觀心性本淨，猶如虛空，即是性淨之境。境，即國也。觀智覺悟此心，名之為佛。初觀名因，觀成名果。若論自行，即是心主無染；若論化他，即是心數解脫。智慧數為大臣，能排諸數上惑，以還心源清淨土也，故云「心淨即佛土淨」也。

Fourth, regarding contemplation of the mind: A later passage says: "In accordance with the purity of their minds, the buddha-land is pure." Contemplating that the mind-nature is fundamentally pure, like empty space, is the realm of the purity of nature. The realm is the land. The contemplative wisdom that awakens to this mind is called the Buddha. Initial contemplation is called the cause; the completion of contemplation is called the effect. If discussed in terms of self-cultivation, it is the master of the mind being undefiled; if discussed in terms of transforming others, it is the mental factors being liberated. The factor of wisdom serves as the prime minister, able to dispel the delusions upon the other factors in order to restore the mind-source to the pure land; therefore it says: "If the mind is pure, the buddha-land is pure."