Bastir means to build or to construct.
Here's the breakdown of the sentence:
* Continuel ouvrage: Continuous work
* de notre vie: of our life
* bastir: to build
* la...: (The sentence is incomplete, but "la" likely refers to something being built)
So, the complete sentence would likely be something like:
"Continuel ouvrage de notre vie bastir la maison" which translates to: "The continuous work of our life is to build the house".