Ecclesiastes 9-14

9Besides being wise, the Preacher also taught the people knowledge, weighing and studying and arranging many proverbs with great care. 10The Preacher sought to find words of delight, and uprightly he wrote words of truth.
11The words of the wise are like goads,

and like nails firmly fixed are the collected sayings; they are given by one Shepherd. 12My son, beware of anything beyond these. Of making many books there is no end, and much study is a weariness of the flesh.
13The end of the matter; all has been heard.

Fear God and keep his commandments, for this is the whole duty of man. 14For God will bring every deed into judgment, with every secret thing, whether good or evil.
Ecclesiastes 12:9-14

9Besides being wise, the Preacher also taught the people knowledge, weighing and studying and arranging many proverbs with great care. 10The Preacher sought to find words of delight, and uprightly he wrote words of truth.
Ecclesiastes 12:9-10

11The words of the wise are like goads, and like nails firmly fixed are the collected sayings; they are given by one Shepherd.
Ecclesiastes 12:11

23And I will set up over them one shepherd, my servant David, and he shall feed them: he shall feed them and be their shepherd.
Ezekiel 34:23

13The end of the matter; all has been heard. Fear God and keep his commandments, for this is the whole duty of man. 14For God will bring every deed into judgment, with every secret thing, whether good or evil.
Ecclesiastes 12:13-14

12“And now, Israel, what does the LORD your God require of you, but to fear the LORD your God, to walk in all his ways, to love him, to serve the LORD your God with all your heart and with all your soul, 13and to keep the commandments and statutes of the LORD, which I am commanding you today for your good?
Deuteronomy 10:12-13

First motivation: “...for this is the whole duty of man.”

Second motivation: “...For God will bring every deed into judgment, with every secret thing, whether good or evil.”

For the Father judges no one, but has given all judgment to the Son...truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life.

He does not come into judgment, but has passed from death to life.
John 5:22, 24