The two disciples who walked to Emmaus and conversed together, and were sad, were true believers. We may not judge men by their occasional feelings. The possession of gladness is no clear evidence of grace; and the existence of depression is no sure sign of insincerity. The brightest eyes that look for heaven have sometimes been holden so that they could not see their heart’s true joy. Be not cast down, my brethren and sisters, if occasionally the tears of sadness bathe your cheeks. Jesus may be drawing near to you, and yet you may be troubled by mysteries of grief.

The Lord Jesus Christ came to the two disciples, and took a walk of some seven miles with them to remove their sadness; for it is not the will of our Lord that his people should be cast down. The Savior does himself that which he commanded the ancient prophet to do. “Comfort ye, comfort ye my people, saith your God. Speak ye comfortably to Jerusalem.” Thus he spake and thus he acts. He was pleased when he went away to send us another Comforter, because he wishes us to abound in comfort; but that promise proves that he was, and is, himself a Comforter. Do not dream, when in sadness, that your Lord has deserted you; rather reckon that for this very reason he will come to you. As her babe’s cry quickens the mother’s footsteps to come to it more speedily, So shall your griefs hasten the visits of your Lord. He hears your groanings; he sees your tears—are they not in his bottle? He will come to you as the God of all consolation.

Observe that, when the Savior did come to these mourning ones, he acted very wisely towards them. He did not at once begin by saying, “I know why you are sad.” No; he waited for them to speak, and in his patience drew forth from them the items and particulars of their trouble. You that deal with mourners, learn hence the way of wisdom. Do not talk too much yourselves. Let the swelling heart relieve itself. Jeremiah derives a measure of help from his own lamentations: even Job feels a little the better from pouring out his complaint. Those griefs which are silent run very deep, and drown the soul in misery. It is good to let sorrow have a tongue where sympathy hath an ear. Allow those who are seeking the Lord to tell you their difficulties: do not discourse much with them till they have done so. You will be the better able to deal with them, and they will be the better prepared to receive your words of cheer. Often, by facing the disease of sorrow the cure is half effected; for many doubts and fears vanish when described. Mystery gives a tooth to misery, and when that mystery is extracted by a clear description, the sharpness of the woe is over. Learn, then, ye who would be comforters, to let mourners hold forth their wound before you pour in the oil and wine.
                                                                                                                –Charles Spurgeon, “Folly of Unbelief”, August 28, 1887

The entire sermon is well worth reading, both for those who need encouragement and for those love to encourage.