Whether the suffrages of one person can profit others?

Objections

Objection 1 : It would seem that the suffrages of one person cannot profit others. For it is written (Gal. 6:8): "What things a man shall sow, those also shall he reap." Now if one person reaped fruit from the suffrages of another, he would reap from another's sowing. Therefore a person receives no fruit from the suffrages of others.
Objection 2 : Further, it belongs to God's justice, that each one should receive according to his merits, wherefore the psalm (Ps. 61:13) says: "Thou wilt render to every man according to his works." Now it is impossible for God's justice to fail. Therefore it is impossible for one man to be assisted by the works of another.
Objection 3 : Further, a work is meritorious on the same count as it is praiseworthy, namely inasmuch as it is voluntary. Now one man is not praised for the work of another. Therefore neither can the work of one man be meritorious and fruitful for another.
Objection 4 : Further, it belongs to Divine justice to repay good for good in the same way as evil for evil. But no man is punished for the evildoings of another; indeed, according to Ezech. 18:4, "the soul that sinneth, the same shall die." Therefore neither does one person profit by another's good.