Horatius Bonar, writing the preface to John Gillies' Accounts of Revival, proposes that men useful to the Holy Spirit for revival have been marked in these nine ways:
1. They were in earnest about the great work on which they had entered: "They lived and labored and preached like men on whose lips the immortality of thousands hung."
2. They were bent on success: "As warriors, they set their hearts on victory and fought with the believing anticipation of triumph, under the guidance of such a Captain as their head."
3. They were men of faith: "They knew that in due season they should reap, if they fainted not."
4. They were men of labor: "Their lives are the annals of incessant, unwearied toil of body and soul; time, strength, substance, health, all they were and possessed they freely offered to the Lord, keeping back nothing, grudging nothing."
5. They were men of patience: "Day after day they pursued what, to the eye of the world, appeared a thankless and fruitless round of toil."
6. They were men of boldness and determination: "Timidity shuts many a door of usefulness and loses many a precious opportunity; it wins no friends, while it strengthens every enemy. Nothing is lost by boldness, nor gained by fear."
7. They were men of prayer: "They were much alone with God, replenishing their own souls out of the living fountain, that out of them might flow to their people rivers of living water."
8. They were men whose doctrines were of the most decided kind: "Their preaching seems to have been of the most masculine and fearless kind, falling on the audience with tremendous power. It was not vehement, it was not fierce, it was not noisy; it was far too solemn to be such; it was massive, weighty, cutting, piercing, sharper than a two-edged sword."
9. They were men of solemn deportment and deep spirituality of soul: "No frivolity, no flippancy . . . . The world could not point to them as being but slightly dissimilar from itself."