COMMENTARY on 4:104
A. Yusuf Ali:

Translation:
And slacken not in following up the enemy: If you are suffering hardships, they are suffering similar hardships; but you have Hope from Allah, while they 620 have none. And Allah is full of knowledge and wisdom.
Commentary:

620  Religion should be a source of strength and not of weakness in all our affairs. If we have to struggle hard and suffer hardships, those without faith have to do the same, with this difference, that the man of Faith is full of hope in Allah, whereas the man without faith has nothing to sustain him.