Pray in the Spirit at all times and on every occasion. Stay alert and be persistent in your prayers for all believers everywhere. Ephesians 6:18 (NLT)
Prayer is part of our protection from the evil one. Praying for one another at all times, whether we know what the other person needs at that moment or not (for the Spirit knows), not only supports our Christian brothers and sisters, but keeps us mindful of the fact that we are continually dependent upon God.