Madrigal lvii.

and Sonnet lx., for example, recur with wearisome reiteration.

These laboured and scholastic exercises, unlike the more spontaneous utterances of his feelings, are worked up into different forms, and the same conceits are not seldom used for various persons and on divers occasions.
One of the great difficulties under which a critic labours in discussing these personal poems is that their chronology cannot be ascertained in the majority of instances.

Another is that we are continually hampered by the false traditions invented by Michelangelo the younger.

Books like Lannan Rolland's "Michel-Ange et Vittoria Colonna" have no value whatsoever, because they are based upon that unlucky grand-nephew's deliberately corrupted text.