Psalms 126:5 - Albert Barnes' Notes on the Bible

They that sow in tears shall reap in joy - Though the sowing of seed is a work of labor and sorrow - often a work so burdening the farmer that he weeps - yet the return - the harvest - is accompanied with rejoicing. The truth is expressed in a general form, as illustrating the idea that enterprises which are begun under many difficulties, and which require much labor, will be crowned with success, and that the joy is more than an equivalent for all the weariness and sorrow. Thus it is in respect to the toil of the farmer; the cares and anxieties of the student; the work of conversion and repentance; the labors of the Christian pastor; the efforts of the Sabbath-school teacher; the faithfulness of the Christian parent; the endeavors of a church for a revival of religion; the zeal and sacrifice of the Christian missionary. The particular, allusion here is to the exiles, in their long and weary march to their native land. It was a work of toil and tears, but there would be joy, like that of the harvest, when, their long journey over they should again come to their native land. Compare Isaiah 9:3.