"I preached divine sovereignty when revival was in full swing and it deepened and continued the work. The omission of certain truths from certain ministries may account for their barrenness. O that ministers would believe that the Word needs no improving, but is already perfect, 'converting the soul,'; and that it requires no suiting to the times, for it still makes the simple wise." (Source: Spurgeon's Sermon Notes)
Recommended reading:
The Conversion of Charles Spurgeon
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon