The Acquisition of Grace:

“Acquire the grace of the Holy Spirit also by practicing all the other virtues for Christ’s sake. Trade spiritually with them; trade with those which give you the greatest profit. Accumulate capital from the superabundance of God’s grace, deposit it in God’s eternal bank which will bring you immaterial interest, not four or six per cent, but one hundred per cent for one spiritual ruble, and even infinitely more than that. For example, if prayer and watching gives you more of God’s grace, watch and pray; if fasting gives you much of the spirit of God, fast; if almsgiving gives you more, give alms. Weigh every virtue done for Christ’s sake in this manner."

Saint Seraphim of Sarov