So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. Then, late at night, a glorious deity, lighting up the entire Jeta’s Grove, went up to the Buddha, bowed, and stood to one side. That deity...
“Monks, there are two people who are not easy to repay. Which two? Your mother & father. Even if you were to carry your mother on one shoulder and your father on the other shoulder for 100 years, and were to look after them by anointing, massaging, bathing, &...
“So you should train like this: ‘We will be grateful & thankful. We won’t forget even a small thing done for us.’ That’s how you should train.” Saṁyutta NikāyaDutiyasiṅgālasutta SN 20.12
“These two people are rare in the world. What two? One who takes the initiative in helping others, & one who is grateful and thankful.” Aṅguttara NikāyaDullabha Sutta AN 2.119
“Someone with four qualities is raised up to heaven. What four? Good conduct by way of body, speech & mind, and being grateful & thankful.” Aṅguttara NikāyaAkataññutāsutta AN 4.213