Joys and tensions are ephemeral aspects of life.

Ephemeral : lasting for a very short time.
Stable : (of an object or structure) not likely to give way or overturn; firmly fixed.
Permanent : lasting or intended to last or remain unchanged indefinitely.
Spiritual : relating to or affecting the human spirit or soul as opposed to material or physical things.
Ethical : relating to moral principles or the branch of knowledge dealing with these.

Antonym of Ephemeral is Permanent