Webster(i)
17 Therefore I hated life; because the work that is wrought under the sun is grievous to me: for all is vanity and vexation of spirit.
18 Yes, I hated all my labor which I had taken under the sun: because I should leave it to the man that shall be after me.
19 And who knoweth whether he shall be a wise man or a fool? yet shall he have rule over all my labor in which I have labored, and in which I have showed myself wise under the sun. This is also vanity.