'Complete' in the Bible

""The LORD also announces to you: "The LORD will himself build a house for you. When your life is complete and you go to join your ancestors, I will raise up your offspring after you, who will come forth from your body, and I will fortify his kingdom.

Nathan communicated this complete oracle to David with precisely these words.

And it cometh to pass, at the end of forty years, that Absalom saith unto the king, 'Let me go, I pray thee, and I complete my vow, that I vowed to Jehovah in Hebron,

Is not my dynasty like this with God? Has he not made an eternal covenant with me, preparing every detail of it? And he has made it secure, including my complete salvation, has he not? He has been of continual help, has he not, even with respect to all of my desires?