The God of Salvation will send forth a quiet call via the Holy Spirit

"Before we as a people, or as an individual, can rise to the glorious challenge of building our latter-day Zion, the 'call of Zion' must be heard once again. Every entrant into that holy city will have heard its MIGHTY TOLLING in their hearts and made SWEEPING personal preparations to be worthy of Zion, or Zion will be invisible to them. …The God of Salvation will send forth a quiet call via the Holy Spirit that will whisper within the souls of all whose ears are DIVINELY TUNED to such things, and that tinkling truth will be 'the call of Zion.'"

John Pontius, "The Triumph of Zion", pg. 85