Invest in God’s Kingdom and not your own monopoly

2 I say: Keep the king's command, because of God's oath to him. 3 Be not hasty to go from his presence. Do not take your stand in an evil cause, for he does whatever he pleases. 4 For the word of the king is supreme, and who may say to him, “What are you doing?” 5 Whoever keeps a command will know no evil thing, and the wise heart will know the proper time and the just way.
Ecclesiastes 8
:2-5

9 Enjoy life with the wife whom you love, all the days of your vain life that he has given you under the sun, because that is your portion in life and in your toil at which you toil under the sun. 10 Whatever your hand finds to do, do it with your might, for there is no work or thought or knowledge or wisdom in Sheol, to which you are going
Ecclesiastes 9:9-10

Whatever your hand finds to do, do it with your might, for there is no work or thought or knowledge or wisdom in Sheol, to which you are going
Ecclesiastes 9:10

Putting godly investment into your relationships is kingdom investment

14 There was a little city with few men in it, and a great king came against it and besieged it, building great siegeworks against it. 15 But there was found in it a poor, wise man, and he by his wisdom delivered the city. Yet no one remembered that poor man
Ecclesiastes 9:14-15.

Putting godly investment into your relationship with Jesus is essential

18 Wisdom is better than weapons of war, but one sinner destroys much good. 10:1 Dead flies make the perfumer’s ointment give off a stench; so a little folly outweighs wisdom and honor.
Ecclesiastes 9:18; 10:1

Even in your thoughts, do not curse the king, nor in your bedroom curse the rich, for a bird of the air will carry your voice, or some winged creature tell the matter.
Ecclesiastes 10:20