Quotes from the Lotus Sutra, Vol. 1
"The wisdom of Buddhas is both profound and immeasurable, and the gateways to this wisdom are hard to understand and enter. No śrāvaka or pratyekabuddha can apprehend it. Why is this? This is because every Buddha has been closely associated with hundreds of thousands of billions of Buddhas in the past to fully practice the infinite paths of Buddhas, to be courageous and diligent, to be universally known, to attain profound and unprecedented Dharma, and to teach others wherever and whenever possible. Yet the true meaning and intent of these Dharmas are too profound to grasp."
《妙法蓮華經》卷一
方便品第二
【諸佛智慧甚深無量，其智慧門難解難入，一切聲聞、辟支佛所不能知。所以者何？佛曾親近百千萬億無數諸佛，盡行諸佛無量道法，勇猛精進，名稱普聞，成就甚深未曾有法，隨宜所說意趣難解。】