Morphy's principal strength does not rest upon his power of combination but in his position play and his general style.... Beginning with la Bourdonnais to the present, and including Lasker, we find that the greatest stylist has been Morphy. Whence the reason, although it might not be the only one, why he is generally considered the greatest of all.
In Pablo Morphy by V. F. Coria and L. Palau.