Philippians 4:6,7

Be anxious for nothing, but in everything by prayer and supplications, with thanksgiving, let your requests be made known to God; and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus.

We are not to fear or be anxious about anything, and God means anything.  To do this, we have to keep in prayer, supplication, thanksgiving, and making a request to God.  We cannot let up, give in, or be distracted, or we will lose ground.  Is it easy? Not always.  However, the peace and understanding we gain to stand confident against the enemy are well worth it.