Doubt not but angling will prove to be so pleasant that it will prove to be, like virtue, a reward to itself.
Source, in full
Part I, ch. 1. Compare: "Virtue is her own reward", John Dryden, Tyrannic Love, act iii, scene 1; "Virtue is to herself the best reward", Henry More, Cupid's Conflict; "Virtue is its own reward", Matthew Prior, Imitations of Horace, book iii. ode 2; John Gay, Epistle to Methuen; Home, Douglas, act iii, scene 1. "Virtue was sufficient of herself for happiness", Diogenes Laertius, Plato, xlii; "Ipsa quidem virtus sibimet pulcherrima merces" ("Virtue herself is her own fairest reward"), Silius Italicus (25?–99): Punica, lib. xiii. line 663