Shakya Muni attained to Buddhaship in his thirtieth year, and sat motionless for seven days under the Bodhi tree, absorbed in deep meditation, enjoying the first bliss of his Enlightenment. In the second week he preached his Dharma to the innumerable multitude of Bodhisattvas,[FN#112] celestial beings, and deities in the nine assemblies held at seven different places. This is the origin of a famous Mahayana book entitled Buddhavatamsaka-mahavaipulya-sutra. In this book the Buddha set forth his profound Law just as it was discovered by his highly Enlightened mind, without considering the mental states of his hearers. Consequently the ordinary hearers (or the Buddha's immediate disciples) could not understand the doctrine, and sat stupefied as if they were 'deaf and dumb,' while the great Bodhisattvas fully understood and realized the doctrine. This is called the first period, which lasted only two or three[FN#113] weeks.
[FN#112] Bodhisattva is an imaginary personage, or ideal saint, superior to Arhat, or the highest saint of Hinayanism. The term 'Bodhisattva' was first applied to the Buddha before his Enlightenment, and afterwards was adopted by Mahayanists to mean the adherent of Mahayanism in contradistinction with the Cravaka or hearers of Hinayanism.
[FN#113] Bodhiruci says to the effect that the preachings in the first five assemblies were made in the first week, and the rest were delivered in the second week. Nagarjuna says that the Buddha spoke no word for fifty-seven days after his Enlightenment. It is said in Saddharma-pundarika-sutra that after three weeks the Buddha preached at Varanasi, and it says nothing respecting Avatamsaka-sutra. Though there are divers opinions about the Buddha's first sermon and its date, all traditions agree in this that he spent some time in meditation, and then delivered the first sermon to the five ascetics at Varanasi.
Thereupon Shakya Muni, having discovered that ordinary bearers were too ignorant to believe in the Mahayana doctrine and appreciate the greatness of Buddhahood, thought it necessary to modify his teaching so as to adjust it to the capacity of ordinary people. So he went to Varanasi (or Benares) and preached his modified doctrine—that is, Hinayanism. The instruction given at that time has been handed down to us as the four Agamas,[FN#114] or the four Nikayas. This is called the second period, which lasted about twelve years. It was at the beginning of this period that the Buddha converted the five ascetics,[FN#115] who became his disciples. Most of the ăravakas or the adherents of Hinayanism were converted during this period. They trained their hearts in accordance with the modified Law, learned the four noble truths,[FN#116] and worked out their own salvation.
[FN#114] (1) Anguttara, (2) Majjhima, (3) Digha, (4) Samyutta.
[FN#115] Kondanynya, Vappa, Baddiya, Mahanana, Assaji.
[FN#116] The first is the sacred truth of suffering; the second the truth of the origin of suffering—that is, lust and desire; the third the sacred truth of the extinction of suffering; the fourth the sacred truth of the path that leads to the extinction of suffering. There are eight noble paths that lead to the extinction of suffering—that is, Right faith, Right resolve, Right speech, Right action, Right living, Right effort, Right thought, and Right meditation.
The Buddha then having found his disciples firmly adhering to Hinayanism without knowing that it was a modified and imperfect doctrine, he had to lead them up to a higher and perfect doctrine that he might lead them up to Buddhahood. With this object in view Shakya Muni preached Vimalakirtti-nirdeca-sutra[FN#117], Lankavatara-sutra, and other sutras, in which he compared Hinayanism with Mahayanism, and described the latter in glowing terms as a deep and perfect Law, whilst he set forth the former at naught as a superficial and imperfect one. Thus he showed his disciples the inferiority of Hinayanism, and caused them to desire for Mahayanism. This is said to be the third period, which lasted some eight years.
[FN#117] This is one of the most noted Mahayana books, and is said to be the best specimen of the sutras belonging to this period. It is in this sutra that most of Shakya's eminent disciples, known as the adherents of Hinayanism, are astonished with the profound wisdom, the eloquent speech, and the supernatural power of Vimalakirtti, a Bodhisattva, and confess the inferiority of their faith. The author frequently introduces episodes in order to condemn Hinayanism, making use of miracles of his own invention.
The disciples of the Buddha now understood that Mahayanism was far superior to Hinayanism, but they thought the higher doctrine was only for Bodhisattvas and beyond their understanding. Therefore they still adhered to the modified doctrine, though they did no longer decry Mahayanism, which they had no mind to practise. Upon this Shakya Muni preached Prajnyaparamita-sutras[FN#118] in the sixteen assemblies held at four different places, and taught them Mahayanism in detail in order to cause them to believe it and practise it. Thus they became aware that there was no definite demarcation between Mahayanism and Hinayanism, and that they might become Mahayanists. This is the fourth period, which lasted about twenty-two years. Now, the Buddha, aged seventy-two, thought it was high time to preach his long-cherished doctrine that all sentient beings can attain to Supreme Enlightenment; so he preached Saddharma-pundarika-sutra, in which he prophesied when and where his disciples should become Buddhas. It was his greatest object to cause all sentient beings to be Enlightened and enable them to enjoy the bliss of Nirvana. It was for this that he had endured great pain and hardships through his previous existences. It was for this that he had left his heavenly abode to appear on earth. It was for this that he had preached from time to time through his long career of forty-seven years. Having thus realized his great aim, Shakya Muni had now to prepare for his final departure, and preached Mahaparinirvana-sutra in order to show that all the animated and inanimate things were endowed with the same nature as his. After this last instruction he passed to eternity. This is called the fifth period, which lasted some eight years.