All That We Have is a popular Catholic hymn by Gary Ault that can be used at several points in the Mass including Opening and during Preparation of the Gifts.

Song Title: All That We Have

Artist(s): Gary Ault

Publisher: ©1979 Damean Music

Where to Purchase: https://www.ocp.org/en-us/songs/11072/all-that-we-have

From Wikipedia:

The Dameans were a group of Catholic musicians who rose to prominence in the folk music era of the 1970s. They began as seminarians at Notre Dame Seminary in New Orleans, Louisiana, having formed circa 1967. The group was originally composed of Darryl Ducote, Mike Balhoff, Dave Baker, Buddy Ceasar, and Gary Ault (and two others who participated early on).

By the early 1980s, along with such groups as the St. Louis Jesuits, The Dameans' music "dominate[d] the publications scene" in contemporary Catholic liturgical music. As part of the "second phase" of post-Conciliar Catholic folk music, the Dameans' songs reflected attention to liturgical and Biblical texts, and several were represented in the original Glory and Praise hymnals, Volume 2 of 1979 and Volume 3, 1981. Their most popular songs included Look Beyond and All That We Have.