There is a noisy zeal, without aim or purpose, which is not according to knowledge, which is blind in its operations and destructive in its results. This is not Christian zeal. Christian zeal is controlled by principle and is not spasmodic. It is earnest, deep, and strong, engaging the whole soul and arousing to exercise the moral sensibilities. The salvation of souls and the interests of the kingdom of God are matters of the highest importance. What object is there that calls for greater earnestness than the salvation of souls and the glory of God? There are considerations here which cannot be lightly regarded. They are as weighty as eternity. Eternal destinies are at stake. Men and women are deciding for weal or woe. Christian zeal will not exhaust itself in talk, but will feel and act with vigor and efficiency. Yet Christian zeal will not act for the sake of being seen. Humility will characterize every effort and be seen in every work. Christian zeal will lead to earnest prayer and humiliation, and to faithfulness in home duties. In the family circle will be seen the gentleness and love, benevolence and compassion, which are ever the fruits of Christian zeal....
(1TT 236.1)
Oh, how few feel the worth of souls! How few are willing to sacrifice to bring souls to the knowledge of Christ! There is much talking, much professed love for perishing souls; but talk is cheap stuff. It is earnest Christian zeal that is wanted—a zeal that will be manifested by doing something. All must now work for themselves, and when they have Jesus in their hearts they will confess Him to others. No more could a soul who possesses Christ be hindered from confessing Him than could the waters of Niagara be stopped from flowing over the falls.
(1TT 236.2)