III. The same figure of the 'damsel named Rhoda' may give us a warning as to the possibility of forgetting very plain duties under the pressure of very legitimate excitement. 'She opened not the door for gladness,' but ran in and told them. And if, whilst she was running in with her message, Herod's quaternions of soldiers had come down the street, there would have been 'no small stir' in the church as to 'what had become of Peter.' He would have gone back to his prison sure enough. Her _first_ duty was to open the door; her _second_ one was to go and tell the brethren, 'we have got him safe inside'; but in the rush of joyous emotions she naively forgot what her first business was, 'lost her head,' as we say, and so went off to tell that he was outside, instead of letting him in. Now joy and sorrow are equally apt to make us forget plain and pressing duties, and we may learn from this little incident the old-fashioned, but always necessary advice, to keep feeling well under control, to use it as impulse, not as guide, and never to let emotion, which should be down in the engine-room, come on deck and take the helm. It is dangerous to obey feeling, unless its decrees are countersigned by calm common sense illuminated by Scripture. Sorrow is apt to obscure duty by its darkness, and joy to do so by its dazzle. It is hard to see the road at midnight, or at midday when the sun is in our eyes. Both need to be controlled. Duty remains the same, whether my heart is beating like a sledge-hammer, or whether 'my bosom's lord sits lightly on its throne.' Whether I am sad or glad, the door that God has given me to watch has to be opened and shut by me. And whether I am a door-keeper in the house of the Lord, like Rhoda in Mary's, or have an office that people think larger and more important, the imperativeness of my duties is equally independent of my momentary emotions and circumstances. Remember, then, that duty remains while feeling fluctuates, and that, sorrowful or joyful, we have still the same Lord to serve and the same crown to win. IV. Lastly, we have here an instance of a very modest but positive and fully-warranted trust in one's own experience in spite of opposition.