Jamieson, Fausset and Brown on Philippians 1:22

22. Rather as Greek, "But if to live in the flesh (if), this (I say, the continuance in life which I am undervaluing) be the fruit of my labor (that is, be the condition in which the fruit of my ministerial labor is involved), then what I shall choose I know not (I cannot determine with myself, if the choice were given me, both alternatives being great goods alike)." So Alford and Ellicott. Bengel takes it as English Version, which the Greek will bear by supposing an ellipsis, "If to live in the flesh (be my portion), this (continuing to live) is the fruit of my labor," that is, this continuance in life will be the occasion of my bringing in "the fruit of labor," that is, will be the occasion of "labors" which are their own "fruit" or reward; or, this my continuing "to live" will have this "fruit," namely, "labors" for Christ. Grotius explains "the fruit of labor" as an idiom for "worthwhile"; If I live in the flesh, this is worth my while, for thus Christ's interest will be advanced, "For to me to live is Christ" (Php 1:21; compare Php 2:30; Ro 1:13). The second alternative, namely, dying, is taken up and handled, Php 2:17, "If I be offered."