If you continue unabated in your efforts, you will steadily increase the capacity within your national community to accompany large numbers of believers through a well-defined sequence of courses, helping them to acquire the needed capabilities of service.
(Universal House of Justice, 1998 Apr, Training Institutes)
Most noteworthy in this regard is the spirit of initiative shown by believers who extend the range of their endeavors to assist others also striving to tread a path of service. Having acquired the capacity to serve as tutors of institute courses, they take up the challenge of accompanying participants in their initial attempts to perform acts of service until they, too, are ready to start their own study circles and help others do the same, widening in this way the scope of the institute’s influence and bringing eager souls into contact with the Word of God.
(Universal House of Justice, To the Conference of the Continental Boards of Counsellors, 27 December 2005)
That the Bahá’í world has succeeded in developing a culture which promotes a way of thinking, studying, and acting, in which all consider themselves as treading a common path of service—supporting one another and advancing together, respectful of the knowledge that each one possesses at any given moment and avoiding the tendency to divide the believers into categories such as deepened and uninformed—is an accomplishment of enormous proportions. And therein lie the dynamics of an irrepressible movement.
(Ridvan message 2010, paragraph 10)
There may indeed be circumstances where a course conducted over the phone would be of benefit to certain individuals who could not otherwise participate in a study circle; and presumably, there would be no objection if you pursued such an approach on a personal basis.
(Universal House of Justice to an individual, 24 July 2006)
They should stand shoulder to shoulder with the friends, supporting them through their struggles and partaking in their joys. Some of these friends will quickly move to the forefront of activity, while others will step forward more tentatively; yet all require support and encouragement, offered not in the abstract but on the basis of that intimate knowledge which is only acquired by working side by side in the field of service. Faith in the capacity of every individual who shows a desire to serve will prove essential to the efforts of those who are to elicit from the believers wholehearted participation in the Plan. Unqualified love free of paternalism will be indispensable if they are to help turn hesitation into courage born of trust in God and transform a yearning for excitement into a commitment to long-term action. Calm determination will be vital as they strive to demonstrate how stumbling blocks can be made stepping stones for progress. And a readiness to listen, with heightened spiritual perception, will be invaluable in identifying obstacles that may prevent some of the friends from appreciating the imperative of unified action.
(Universal House of Justice, Ridvan message 2010, paragraph 5)
… labor together ceaselessly, delighting not so much in their own accomplishments but in the progress and services of others. So that their thoughts are centered at all times on helping one another scale the heights of service to His Cause and soar in the heaven of His knowledge.
(Universal House of Justice, Ridvan 2010 message)