The Buddha evidently had quite a pragmatic conception of the intellect and left many philosophical problems unsolved as unnecessary for the attainment of the final goal of life. This was quite natural with him. Whilst he was still alive among his disciples, he was the living illustration of all that was implied in his doctrine. The Dharma was manifest in him in all its vital aspects, and there was no need to indulge in idle speculation as to the ultimate meaning of such concepts as Dharma, Nirvana, Atman (ego), Karma, Bodhi (enlightenment), etc. The Buddha’s personality was the key to the solution of all these. The disciples were not fully aware of the significance of this fact. When they thought they understood the Dharma, they did not know that this understanding was really taking refuge in the Buddha. His presence somehow had a pacifying and satisfying effect on whatever spiritual anguish they had; they felt as if they were securely embraced in the arms of a loving, consoling mother; to them the Buddha was really such.[f20] Therefore, they had no need to press the Buddha very hard to enlighten them on many of the philosophical problems that they might have grown conscious of. They were easily reconciled in this respect to the Buddha’s unwillingness to take them into the heart of metaphysics. But at the same time this left much room for the later Buddhists to develop their own theories not only as to the teaching of the Buddha but mainly as to its relation to his personality. * * * * * The Buddha’s entrance into Nirvana meant to his disciples the loss of the World-Light,[f21] through which they had such an illuminating view of things. The Dharma was there and in it they tried to see the Buddha as they were instructed by him, but it had no enlivening effect on them as before; the moral precepts consisting of many rules were regularly observed in the Brotherhood, but the authoritativeness of these regulations was missed somehow. They retired into a quietude and meditated on the teaching of the Master, but the meditation was not quite so life-giving and satisfying because they were ever assailed by doubts, and, as a natural consequence, their intellectual activities were resumed. Everything was now to be explained to the full extent of the reasoning faculty. The metaphysician began to assert himself against the simple-hearted devotion of the disciple. What has been accepted as an authoritative injunction from the mouth of the Buddha, was now to be examined as a subject of philosophical discussion. Two factions were ready to divide the field with each other, and radicalism was opposed to conservatism, and between the two wings there were arranged schools of various tendencies. The Sthaviras were pitted against the Mahāsaṁghikas, with twenty or more different schools representing various grades of diversity.[f22]