
Similarly, the correspondence of a son with his father or mother, or between brothers and sisters, or that of a father with his children, or between friends at a distance from each other, is also founded on faith.
They are sure when writing letters that the persons to whom they write are alive; they trust that their written conversation will reach them, will produce certain impressions, ideas, and feelings, corresponding to those expressed in the letter, and that they will answer the letter in accordance with its contents.
As in life we are guided in many things by faith and hope, so much more in relation to the spiritual world should we "walk by faith, not by sight."
St John of Kronstadt