Translations
You have said, 'What is the point of serving God? What have we gained by following His commands and going through all the motions of mourning before Yahweh Almighty?'
You have said, 'It is futile to serve Elohim. What profit is there in keeping His charge or in walking in mourning garb before YHWH-Tzva'ot?'
Ye have said, It is vain to serve God: and what profit is it that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts?
You have said, ‘It is futile to serve God. What have we gained by keeping His requirements and walking mournfully before the LORD of Hosts?

