(From [0])

'A man may do an immense deal of good, if he does not care who gets the credit for it.'

"QI hypothesizes that a Jesuit Priest named Father Strickland deserves primary credit for this family of sayings. This claim is based on the diary entry dated September 21, 1863 written by Sir Mountstuart E. Grant Duff and multiple attributions thereafter. However, similar maxims may have been developed independently."

[0] https://quoteinvestigator.com/2010/12/21/doing-good-selfless