A more thorough explanation:

ob pias causas

Ob pias causas is a Latin term that means doing something for religious or charitable reasons or out of duty.

1. The wealthy businessman donated a large sum of money to the local church ob pias causas.

2. The young man took care of his sick grandmother ob pias causas, as he felt it was his duty to help her.

These examples illustrate how ob pias causas can refer to actions done out of religious or charitable reasons or out of a sense of duty. In the first example, the businessman donated money to the church because he believed it was the right thing to do. In the second example, the young man took care of his grandmother because he felt it was his responsibility as her grandson.