This text comes from The Complete Poetical Works of John Greenleaf Whittier, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
So stood of old the holy Christ
Amidst the suffering throng;
With whom His lightest touch sufficed
To make the weakest strong.
That healing gift He lends to them
Who use it in His name;
The power that filled His garment’s hem
Is evermore the same.
For lo! in human hearts unseen
The Healer dwelleth still,
And they who make His temples clean
The best subserve His will.
The holiest task by Heaven decreed,
An errand all divine,
The burden of our common need
To render less is thine.
The paths of pain are thine. Go forth
With patience, trust, and hope;
The sufferings of a sin-sick earth
Shall give thee ample scope.
Beside the unveiled mysteries
Of life and death go stand,
With guarded lips and reverent eyes
And pure of heart and hand.
So shalt thou be with power endued
From Him who went about
The Syrian hillsides doing good,
And casting demons out.
That Good Physician liveth yet
Thy friend and guide to be;
The Healer by Gennesaret
Shall walk the rounds with thee.