Philippians 1:22-23

But if I live in the flesh. In the body, i.e., on earth.

This [is] the fruit of my labour. In this state the fruit of his labor is Christ. See Php 1:21.

Yet what I shall choose I wot not. He can hardly tell whether he would choose the gain of death, or to continue to live in order that he may work for Christ.
Having a desire to depart. His feelings would lead him to choose to depart from the flesh. See Php 1:24.

And to be with Christ. Note that with Paul to depart from the "flesh", the body, is followed by going immediately to Christ.
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