Frustrated Desire and Disappointment

Edwyn Bevan, Stoics and Sceptics (Oxford: Clarendon Press, 1913), p. 70:

The Stoics, I think, saw with perfect truth that if you were going to allow any least entrance of love and pity into the breast, you admitted something whose measure you could not control, and might just as well give up the idea of inner tranquillity at once. Where love is, action cannot be without desire; the action of love has eminently regard to fruit, in the sense of some result beyond itself — the one thing that seems to matter is whether the loved person really is helped by your action. Of course you run the risk of frustrated desire and disappointment. The Stoic sage was never frustrated and never disappointed.