大方廣佛華嚴經疏 6.34

6.34

第七門，謂佛出難值，引之令值；信心難生，勸之令生。信含眾德，所以名藏。下經云「信為寶藏第一財」故。此於嫉妬邪見障得解脫也。

In the seventh approach, it means that the Buddha's emergence is difficult to encounter, so he leads them to encounter it; faithful mind is difficult to generate, so he encourages them to generate it. Faith contains all virtues, therefore it is called a "treasury." As the sūtra states below: "Faith is a precious treasury, the foremost wealth." This attains liberation from the obstacle of jealousy and wrong views.