The dictionary you linked says “the quality or feeling of being grateful or thankful:”
Grateful being: warmly or deeply appreciative of kindness or benefits received; thankful
Thankful being: feeling or expressing gratitude; appreciative.
If you got a benefit of still being alive and you appretiate that benefit, you can be grateful. It’s not necessary to identify an agent who’s responsible for the benefit. The imporatant thing is that there a benefit and you appretiate the benefit.
The dictionary you linked says “the quality or feeling of being grateful or thankful:”
Grateful being: warmly or deeply appreciative of kindness or benefits received; thankful
Thankful being: feeling or expressing gratitude; appreciative.
If you got a benefit of still being alive and you appretiate that benefit, you can be grateful. It’s not necessary to identify an agent who’s responsible for the benefit. The imporatant thing is that there a benefit and you appretiate the benefit.