He was licensed to preach the gospel by the Presbytery of St Andrews on 2 March 1753, but it was not until 1764 that he was ordained as Minister of Kilmany.
He was technically presented to this charge by King George III, but in fact by Henry Dundas, who exercised the royal patronage in Scotland.
This was during the French Revolutionary Wars and the Government in Britain feared political agitation, so the General Assembly was anxious to demonstrate its loyalty and devotion.
It voted an address to the King, signed by John Adamson, Moderator, which they assured him that They continue to feel and to act as becomes Britons, ready to sacrifice every private consideration in behalf of their beloved Sovereign, of the independence of their country, and of their religion and liberties.While our people patiently and cheerfully endure the inevitable toils and burdens of a war, they join with us in cherishing the pleasing hope of peace, when peace can be obtained on terms fair and honourable, such as will give full security for the many blessings by which your Majesty's subjects are distinguished.
For the attainment of which most desirable object, we rely, under God, with the most entire confidence on the wisdom and vigour of your Majesty's councils.