I do not think there is anything trivial about the Word of God.
Here are some scriptures for you to carefully consider:
2 John 1:8 Watch out that you do not lose what we have worked for, but that you may be rewarded fully.
It only takes one scripture, and this one scripture tells us that it is possible to lose the reward. It only takes one scripture; however, here is more.
1 Corinthians 3:14 If what has been built survives, the builder will receive a reward.
Colossians 3:22-25 Slaves, obey your earthly masters in everything; and do it, not only when their eye is on you and to curry their favor, but with sincerity of heart and reverence for the Lord. 23 Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, 24 since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving. 25 Anyone who does wrong will be repaid for their wrongs, and there is no favoritism.
Matthew 5:46 If you love those who love you, what reward will you get? Are not even the tax collectors doing that?
Matthew 6:1 [ Giving to the Needy ] “Be careful not to practice your righteousness in front of others to be seen by them. If you do, you will have no reward from your Father in heaven.
Matthew 10:40-42 “Anyone who welcomes you welcomes me, and anyone who welcomes me welcomes the one who sent me. 41 Whoever welcomes a prophet as a prophet will receive a prophet’s reward, and whoever welcomes a righteous person as a righteous person will receive a righteous person’s reward. 42 And if anyone gives even a cup of cold water to one of these little ones who is my disciple, truly I tell you, that person will certainly not lose their reward.”