A student went to Mrs. Eddy after having worked on a problem and asked her why she did not receive her results, why she had not had her work rewarded by demonstration. Mrs. Eddy replied, ‘You have done everything rightly, but you have failed to do one thing and that is to stick to it. Error has an end. Truth is eternal.’ Mary Baker Eddy (Oakes, Richard, Course In Divinity and General Collectanea, p.261)