大方廣佛華嚴經疏 52.21

52.21

第五、十種伏藏，即無盡功德藏迴向中行。於一切法蘊斯十義，故名為藏。即法而觀，惑者不見，故名為伏。一切各十，是無盡功德矣。

Fifth, the ten kinds of hidden treasures are practice within the pariṇāmanā of the treasury of inexhaustible virtues. Containing these ten meanings within all phenomena, it is therefore called a "treasury." When contemplating directly through phenomena, the deluded do not see it; hence it is called "hidden." Everything having ten each constitutes inexhaustible virtues.