Hebrew 12:11 Now no chastening for the present seems to be joyous, but grievous: nevertheless afterward it yields the peaceable fruit of righteousness unto them which are exercised thereby. 12 Wherefore lift up the hands which hang down, and the feeble knees; 13 And make straight paths for your feet, lest that which is lame be turned out of the way; but let it rather be healed.
Thus, wherever we can, we should avoid harboring thoughts of giving up, for that is what the adversary wants us to do. When you may have run out words to say, and prayers to pray, still hang in there, for it is the promises and assurances that God is with us, which give the impetus to keep us moving forward.
And we must always bear in mind that feeling down and out applies equally to Christians as well as those persons who may not believe in God, with the main difference being that the Christian has God, at his or her back. Christians might not always feel good, but they are always better off with God. Always.
Satan does not leave a person alone just because an individual does not believe in Jesus. The devil would harass and bother saints, popes and evildoers in the same breath, and those who sit on the fence are fair game as far as he is concerned. Atheists and witches are also not exempt from such harassment, just because they might side with him, for those who side with him are also mown down in cold blood, the same as Christians, if and when he is permitted to do so.
Isaiah 14:12 How art thou fallen from heaven, O Lucifer, son of the morning! how are you cut down to the ground which didst weaken the nations! 18 All the kings of the nations, even all of them, lie in glory, everyone in his own house. 20 Thou shalt not be joined with them in burial, because thou hast destroyed thy land, and slain thy people: the seed of evildoers shall never be renowned.
May The Lord add His blessing to the study of His word. God bless!