They are not suggestions. They are rules we need to follow or we self-destruct. Without these commandments, we sin and harm ourselves and each other. Exodus chapter 20
1Then God spoke all these words, saying,
2"I am the LORD your God, who brought you out of the land of Egypt, out of the house of slavery.
3"You shall have no other gods before Me.
4"You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth.
5"You shall not worship them or serve them; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me,
6but showing lovingkindness to thousands, to those who love Me and keep My commandments.
7"You shall not take the name of the LORD your God in vain, for the LORD will not leave him unpunished who takes His name in vain.
8"Remember the sabbath day, to keep it holy.
9"Six days you shall labor and do all your work,
10but the seventh day is a sabbath of the LORD your God; in it you shall not do any work, you or your son or your daughter, your male or your female servant or your cattle or your sojourner who stays with you.
11"For in six days the LORD made the heavens and the earth, the sea and all that is in them, and rested on the seventh day; therefore the LORD blessed the sabbath day and made it holy.
12"Honor your father and your mother, that your days may be prolonged in the land which the LORD your God gives you.
13"You shall not murder.
14"You shall not commit adultery.
15"You shall not steal.
16"You shall not bear false witness against your neighbor.
17"You shall not covet your neighbor's house; you shall not covet your neighbor's wife or his male servant or his female servant or his ox or his donkey or anything that belongs to your neighbor."
18All the people perceived the thunder and the lightning flashes and the sound of the trumpet and the mountain smoking; and when the people saw it, they trembled and stood at a distance. 19Then they said to Moses, "Speak to us yourself and we will listen; but let not God speak to us, or we will die."
20Moses said to the people, "Do not be afraid; for God has come in order to test you, and in order that the fear of Him may remain with you, so that you may not sin."