Yea, though he live a thousand years twice told, yet hath he seen no good: do not all go to one place? Ecclesiastes 6:6 (KJV)
There is no objective advantage of ‘being alive;’ that is to say, just because you are alive it does not mean you are at a better off position. Qoheleth’s intended meaning is straightforward. “The meaning of the sentence is clear: if one does not enjoy good when one is able, then there is no difference between the living and the dead.” (Seow, 213) The two thousand years that the natural man has over the stillborn adds to no advantage if God does not allow him to enjoy it. “Such a life could last two thousand years and still be futile, if the person never learns to ‘see the good…’ Moreover, it will in any case end in death.” (Provan, 148)
References:
Provan, I. (2001). Ecclesiastes/Song of Songs: The New Application Commentary, Zondervan
Seow, C.L. (1997). Ecclesiastes, Yale University Press