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Just as the roots of trees take firmer hold when they are contending with the wind; so faith takes firmer hold when it struggles with adverse appearances.

Robert Murray M'Cheyne (1847). “Additional Remains of the Rev. Robert Murray M'Cheyne, Late Minister of St. Peter's Church, Dundee: Consisting of Various Sermons and Lectures Delivered by Him in the Course of His Ministry”, p.470
Just as the roots of trees take firmer hold when they are contending with the wind; so faith takes firmer hold when it struggles with adverse appearances.