"May we seek those things which are beneficial to our brothers, without counting the cost,
—to help them on the way to salvation."
"Quæ fratribus nostris sunt utilia, nos quærere concede,
—ut salutem facilius consequantur."
[Those things] which are profitable to our brethren allow us to seek,
—that they may [as a consequence] more easily obtain salvation.
Intercessions (Preces), Morning Prayer, Second Monday in Ordinary Time, Liturgy of the hours. "without counting the cost" is nowhere present in the Latin, which I've taken from here.