[2:244] So fight in God's way, and know that God is Hearing, Knowing.
It means, 'if pain touches you and a cry rises up from you, know that God hears your cry, knows your states, and sees your affairs', so the verse brings about an easing of the pain they endure. They said:
While most people want
ease and comfort,
I wish to complain to you
for then you will hear.