Again, they are minished ... - literally, “And they are made to decrease.” That is - all is in the hand of God. He rules and directs all things. If there is prosperity, it comes from him; if there are reverses, they occur under his hand. People are not always prosperous. There are changes, misfortunes, disappointments, sorrows. God so deals with the race as in the bests manner to secure the recognition of himself: not always sending prosperity, lest people should regard it as a thing of course, and forget that it comes from him; and not making the course of life uniformly that of disappointment and sorrow, lest they should feel that there is no God presiding over human affairs. He visits now with prosperity, and now with adversity; now with success, and now with reverses, showing that his agency is constant, and that people are wholly dependent on him. In existing circumstances - since man is what he is - it is better that there should be alternations, reverses, and changes, than that there should be a uniform course.
Through oppression - Anything that “presses” or “straitens.”
Affliction - Evil; here, in the sense of calamity.
And sorrow - Anguish, pain: of body or mind.