“It is impossible to help all,” says the miser, and — helps none.

[Man kann nicht allen helfen! sagt der Engherzige und — hilft Keinem.]

Marie von Ebner-Eschenbach (1830-1916) Austrian writer

Aphorisms [Aphorismen], No. 105 (1880) [tr. Wister (1883)]
    (Source)

(Source (German)). Alternate translation:

You can't be of help to everybody! say the narrow-minded, and help nobody.
[tr. Scrase/Mieder (1994)]