Things that do not change

• Change
• Existence of time
  • (might not exist the way we currently know it during certain parts of spiritual experiences, like NDEs)

Humans

• Experiencing during any exprience. Existing while existing. Also (unscientifically) named by some: awareness, consciousness.
• Breathing
• Sleeping
• Eating
• Desire for pleasure
• Desire to avoid pain

Universe

• Scientific laws, until improved
• Speed of light. Debatable: BigThink