Jamieson, Fausset and Brown on Ecclesiastes 4:2

2. A profane sentiment if severed from its connection; but just in its bearing on Solomon's scope. If religion were not taken into account (Ec 3:17, 19), to die as soon as possible would be desirable, so as not to suffer or witness "oppressions"; and still more so, not to be born at all (Ec 7:1). Job (Job 3:12; 21:7), David (Psa 73:3, &c.), Jeremiah (Jr 12:1), Habakkuk (Ha 1:13), all passed through the same perplexity, until they went into the sanctuary, and looked beyond the present to the "judgment" (Psa 73:17; Ha 2:20; 3:17, 18). Then they saw the need of delay, before completely punishing the wicked, to give space for repentance, or else for accumulation of wrath (Ro 2:15); and before completely rewarding the godly, to give room for faith and perseverance in tribulation (Psa 92:7-12). Earnests, however, are often even now given, by partial judgments of the future, to assure us, in spite of difficulties, that God governs the earth.