I have run into a number of instances of the use of the word "puritanical" in writings about Mendelssohn (in one instance relating to the fact that he did not like the Victor Hugo play for which he wrote the Ruy blas overture). Serious writers about music should not be so quick to use this word so casually. Surely, they would not be so casual in referring to a particularly devout Renaissance composer in the same way.