The Spiritual Master is present wherever his sincere disciple is trying to serve his instructions. This is possible by the Mercy of Krsna. In your attempts to serve me and in all your sincere devotional sentiments I am with you as My Guru Maharaja is with me. Remember this always.
I hope this meets you well.
Your ever well-wisher,
A. C. Bhaktivedanta Swami
(S.P.Letter to: Bhakta Don 1st December, 1973)