'Prayer functions as a safety valve without which informed Christians would constantly be anxious, aware as they are of the spiritual warfare surrounding them. And since faith is the essential grace expressed by and strengthened through prayer, we might say that we have interceeded enough when we have held before God the major responsibilities which confront us and any wider burdens which the Holy Spirit may suggest from day to day, and have exercized faith that he is at work in these. This is not at all a difficult labour; there may be times when it can be the work of minutes. Too little prayer is an expression of unbelief in God's love and care; so is too much.'
Richard Lovelace, Dynamics of Spiritual Life, p.160.