"Let the church have great care for the weaker brethren, and shape her action with constant reference to them. A strong Christian might do a thousand things lawfully if he only thought of himself, but he will not do one of them because he wishes to act expediently, and would not grieve his brother or cause him to stumble." Spurgeon Sermon Notes
Further recommended reading & listening:
The Best of The Daily Spurgeon
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon