hi steve,i think you're right. perhaps because from the spiritual views of others there is a recognizable truth shared among them.
Enviable is he who loveth and asketh no return. Bowl of Saki, by Hazrat Inayat Khan
A person is apt to think, 'Why should I perform actions that bring me no return? Why should I be kind, where no kindness is shown to me, where there is even no appreciation?' In this way he commercializes his kindness: he gives in order to receive. ... When one loves one must love for the sake of love, not for a return. When one serves one must serve for the sake of service, not for acknowledgement. In everything a person does, if he does not think of reciprocity or appreciation in any manner or form, he may perhaps seem a loser in the beginning, but in the end that person will be the gainer, for he has lived in the world and yet held himself above the world; it cannot touch him.
http://wahiduddin.net/mv2/VIII/VIII_2_28.htm ~~~ Enviable is he who loveth and asketh no return.
https://wahiduddin.net/saki/saki_new.phpsufism has existed before inayat khan, christianity, judaism or islam