Yes, having a sense of gratitude, seeing the endless loop of debts in this world, is not only the foundation of letting of all five kinds of stinginess but also leads to the ending of desire and liberation.
A person of gratitude, never forgetting that he depended, depends on so many sacrifies, beinging by oneself, voluntary and not at all, can be sure that if meeting that of what if beyond debt, hearing the good Dhamma, origin, cause and way of practice to gain the state of one able to give, is not only able to attain Jhana but also to reach paths and the highest fruit.
A person of ingratitude, what ever trying, is and will be lost and it is because of this one should avoid to associate.
Reflection on the many sacrificesbeyond so little joy is something that should be done by those still rejoicing on sensuality as much as possible, reflecting gain, debt and lose in it.
All Brahmaviharas, especially Mudita, are based on a sense of gratitude, a sense of right view. The path to liberation start with gratitude, is it's only door.
Gratitude, a sense of it, increases all desires to abound what is unskilfull and increases all desires to develope and hold on skilfulness.
Tha meditation of Mudita has gratitude as it's cause, aim and release, embodies the joy of letting go best.
Again, maybe now possible to see, to trace.
Also this lesson might be of support: [En] Karma and Gratitude, Bhante Thanissaro
One may find some additional explainings here, or learn about it by doing, giving into at fist had to understand: Sharing merits - (pattanumodana & pattidana)
Never ever think like a thief because if doing so, one is lost and not easily will find in the near of the Noble Domain, a borderland again.
Three kind of people are there, goodness can hardly till never be payed back again: Bahukārasuttaṃ.
But "gifted" of such, the end of tasks and duties is secured and reached.
So is it that a sign of having entered the Noble Domain is overwhelming gratitude toward the Sublime Tripple Gems, having the Sublime Buddha as it's leader.
Gratitude is the paths beginning and it's very end.
Usual training an technics to get familar to a minset of gratitude:
Note that this giving falls actually into the sphere of Silas/duties for one having gone for refuge and are required to not lose the refuge (e.g. breaking the Refuge)
- Abhivadana or : Geating and paying respect, veneration toward people of goodness (guṇa), e.g giver: parents, teacher, clan leader, Brahmans and yogies/recluses (those who bond them to virtue). see: [Q&A] Some talks on duty, debt, respect, gratitude and generosity: joy in
- Morning/Evening devotional "rituals" toward Buddha, Dhamma, Sangha. ( Chantingguide)
- Giving first or repay goodness received.([Hard to find](AN 2.119: Dullabha Sutta — Hard to Find))
- Service/fulfill duties (veyyāvacca, german) for ones "gods" (starting by parents... teacher/admirable friends, the Juwels)
- Practicing Mudita (Pattānuppadānaby = transf. & Abbhanumodana=sharing) sharing merits (dedication of ones merits done, giving back joy and play it forward)
More advanced, if duties are done, is to focus total on practice and complete the task. How ever, even on such level (hardly possible when living in an household), gratitude and fullfilment of duties in possible sphere, does not disappear.
Who ever rejects to fulfill his duties in the releations he nourishes on, will quickly waste his/her past merits allowing his/her stand within, or increases a lot of debts/demerits.
Once off of gratitude means to dwell in a outer region. One is wise to do all effort to enter and remain in borderlands and to fall not appart. It's not so that outer lands are total void of gratitude, by it's Mara and bondage that earn it (sensuality, pride, conceit, desire for becoming or desire for destruction)