There should be no boundaries to human endeavor. However bad life may seem, there is always hope.
Time travel may be possible, but it is not practical.
There are too many accidents that can befall life on a single planet.
Work gives you meaning and purpose and life is empty without it.
We've created life in our own image.
I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.