Paul believed that he was going to be saved from his present circumstances.  He was not going to be put to shame.  Christ would be exalted in him, whether in life or death.  If he continued with his human body, he could do fruitful labor.  He was not sure which he preferred, a human life of work or a divine eternal rest with Christ.  Obviously, it would be far better to depart this life for an eternal life with Christ.  However, it would be better for them, the Philippians, if he remained in his human flesh.  What is best for them?  Paul hoped he would remain with them as they progressed in a joyful faith.  He wanted to come to the Philippi again, where together they could boast about Jesus Christ.