Final answer:
Eschatological reservation suggests that Christian hope is yet to be fully realized and is in contrast to predestination, which states that salvation is pre-determined.
Step-by-step explanation:
Eschatological reservation is the belief that the Christians' fullness of hope is reserved for the future. This concept contrasts with the doctrine of predestination, as popularized by John Calvin, which implies that God has predetermined who will be saved. According to predestination, these outcomes are fixed from birth, and the Protestant work ethic emerged as a way for individuals to look for signs of being chosen through their success and hard work in everyday life.