This is from House of Commons Procedure and Practice, third edition, 2017:
Although the House now has rules to limit the length of speeches, at one time there were few limits and debate often strayed beyond the subject in question. In 1882, J.G. Bourinot, then Clerk of the House, felt the need to add this comment to his overview of parliamentary practice:
A just regard to the privileges and dignity of Parliament demands that its time should not be wasted in idle and fruitless discussion; and consequently every member, who addresses the house, should endeavour to confine himself as closely as possible to the question under consideration.
The hon. member for New Westminster—Burnaby.