4.2.4 Make clear your perspective
Try to avoid speaking impersonally: 'This is the way it is…', 'It is a fact that…'. That will sound dogmatic and leaves no room for anyone else's perspective. Why not start, 'I think…'? A common abbreviation is IMHO (in my humble opinion) – or even IMNSHO (in my not so humble opinion). If you are presenting someone else's views, say so, perhaps by a quote and acknowledgement.