The exhortations made here are not uncommon:

“My friend, if you are not able to leave your children a legacy in the form of money or goods, do not worry about that. And do not wear yourself to death either physically or spiritually in order to accumulate a great deal of property for your children; but see to it, night and day, that you pray for them. Then you will leave them a great legacy of answers to prayer, which will follow them all the days of their life. Then you may calmly and with a good conscience depart from them, even though you may not leave them a great deal of material wealth.”

What makes this quote uncommon is the context in which the author sets it, a context I find adds the encouragement to persevere that the mere exhortation lacks:

“Our family has been a believing and praying family for three generations. The elders have prayed faithfully for their descendants. During my whole life I have walked in the prayers of my parents and forbears and in the answers to these prayers. A quiet rain [of answers to prayer] drips steadily down upon me. I reap, in truth, what others have sown.”

(quotes taken from O. Hallesby, Prayer.)