Translation of certidumbre

The poem hints that it will be a meal of brutality. We cannot understand this act of killing, the act of two little animals, we do not understand the 'why' of life and we do not see the power that steers all.
I will forward the words to you tomorrow or Sunday, once they give their OK. Which hotel did you book? Did you speak to the Chef de cuisine and can I make the reservation at the restaurant?
We walked by waterfalls and rivers, but the water was too cold to swimm in. The hike made us tired and we were in the valley, which meant that we had to climb up again. The climb was difficult.