What did the Buddha say about gratitude? I'm looking for early Sutras that talk about gratitude. I'm especially interested in if there are lists of things that we can be grateful for, and there are sources that deal with gratitude for lay people.

(So far I've seen the Maha-mangala Sutta, which in the translation linked to talks about "blessings", but in another place ("Old Path, White Clouds" by Thich Nhat Hanh) is translated as "observances", so I'm not sure if it's relevant)

Thankful for help and with kind regards,
Tord
The Pali is 'kataññutā' &amp; also 'kataññutā kataveditā'. 'Kataññutā' means 'what others have done for us'. 'Kataveditā' means 'what we must do in return'.

Kataññu (adj.) [cp. Sk. kṛtajña] lit. knowing, i. e. acknowledging what has been done (to one), i. e. grateful often in combn with
katavedin grateful and mindful of benefits
Kataññutā (f.) [abstr. fr. last] gratefulness (defined at KhA 144 as katassa jānanatā)
Kataveditā (f.) [abstr. fr. last] gratefulness:
Pali dictionary

SN 20.12 states:

Tasmātiha bhikkhave, evaṃ sikkhitabbaṃ: ''kataññuno bhavissāma katavedino. Amhesu appakampi kataṃ mā nassissatī''ti. Evaṃ hi vo
bhikkhaveva, sikkhitabbanti.
Monks. You should train yourselves thus: &quot;We will be grateful &amp; thankful and we will not overlook even the least favour done to us&quot;.
This is how you should train yourselves.

AN 2.31-32 state:

Now what is the level of a person of no integrity? A person of no integrity is ungrateful &amp; unthankful.
I tell you, monks, there are two people who are not easy to repay. Which two? Your mother &amp; father. Even if you were to carry your mother
on one shoulder &amp; your father on the other shoulder for 100 years, and
were to look after them by anointing, massaging, bathing, &amp; rubbing
their limbs, and they were to defecate &amp; urinate right there [on your
shoulders], you would not in that way pay or repay your parents.
Mother &amp; father do much for their children. They care for them, they nourish them, they introduce them to this world. But anyone who rouses
his unbelieving mother &amp; father, settles &amp; establishes them in
conviction; rouses his unvirtuous mother &amp; father, settles &amp;
establishes them in virtue; rouses his stingy mother &amp; father, settles
&amp; establishes them in generosity; rouses his foolish mother &amp; father,
settles &amp; establishes them in discernment: To this extent one pays &amp;
repays one's mother &amp; father.

As for the word 'mangala', it means 'luck' or 'blessing' (rather than 'observances')

Mangala (adj.) [cp. Vedic mangala. Expld by Dhtp 24 with root mang, i. e. lucky; see also mañju] auspicious, prosperous, lucky, festive
Nd1 87, 88; KhA 118 sq.; SnA 273, 595; Sdhp 551. -- nt. mangalaŋ good
omen, auspices, festivity