Rahula wrote:this talk by Dr.Peacock is about 'Metta as a path to awakening'
The practice of metta when perfected and combined with insight into inconstancy is a path to awakening, as described in MN52 which was mentioned above:
MN52: Atthakanagara Sutta wrote:Then again, a monk keeps pervading the first direction with an awareness imbued with good will, likewise the second, likewise the third, likewise the fourth. Thus above, below, & all around, everywhere, in its entirety, he keeps pervading the all-encompassing cosmos with an awareness imbued with good will — abundant, expansive, immeasurable, without hostility, without ill will. He reflects on this and discerns, 'This awareness-release through good will is fabricated & intended. Now whatever is fabricated & intended is inconstant & subject to cessation.' Staying right there, he reaches the ending of the mental fermentations. Or, if not, then — through this very Dhamma-passion, this Dhamma-delight, and from the total wasting away of the first five Fetters — he is due to be reborn [in the Pure Abodes], there to be totally unbound, never again to return from that world.
"The ending of the mental fermentations" means full awakening. "The total wasting away of the first five Fetters" means the state of non-return, which implies only one remaining rebirth in the Pure Abodes which will then yield full awakening. These descriptions can be seen in MN118
MN118: Anapanasati Sutta wrote:"In this community of monks there are monks who are arahants, whose mental effluents are ended, who have reached fulfillment, done the task, laid down the burden, attained the true goal, laid to waste the fetter of becoming, and who are released through right gnosis: such are the monks in this community of monks.
"In this community of monks there are monks who, with the wasting away of the five lower fetters, are due to be reborn [in the Pure Abodes], there to be totally unbound, destined never again to return from that world: such are the monks in this community of monks.