~ Zeal
I have intentionally directed your attention to this zeal, so that you become zealous. For once it is part of us, then Divine grace for its part will not omit doing everything with abundance. Thus, when there exists such zeal in the realm of faith and the search for salvation, then everything exists, and the accomplishing of our salvation is undoubtedly in motion and heading towards its goal. When there is no zeal, then there is nothing at all; he who is not zealous for salvation is a non-participant in salvation.
St. Theophan the recluse
The Spiritual Life, (p. 115)
~ Zeal
The point is, as you know, the zeal that we were discussion, that active, live, fervent, untiring zeal that is the sign our spirit has been rehabilitated and restored to its former power through reunion with God by means of the grace and action of the Holy Spirit. We do have outbursts of zeal, but they are only outbursts, and then they are extinguished. The zeal which is always fervent constant and untiring zeal, exists only when our spirit is filled with grace by the Holy Spirit.
St. Theophan the recluse
The Spiritual Life, (p. 116)