Boys will both tire out and grow weary, and young men themselves will without fail stumble,

Even the most vibrant of humans​—“boys” and “young men”—​may be worn down by fatigue and stumble from exhaustion.

Meanwhile, we need not endure in our own strength. Jehovah, whose resources are inexhaustible, can impart power​—even “power beyond what is normal”—​to his servants in times of trial.​—2 Corinthians 4:7.