In defeat, we can stray away from God. Repentance is key. Jesus always rebutted temptation with God's word. So should we. And with accusation, we should stand our ground.
Prayer is a key.
Also, we need to draw on the power of God in these difficult areas. Will power is not really going to work. Our minds are a key battle ground. There is so much confusion and distortion of the truth. So few people even know what a Christian really is.