One way to make your writing more forceful and dynamic, whether you’re writing op-eds on behalf of a client or internal memos or even new business proposals, is to avoid using the phrase “I think.” Implicitly, when you write something you believe it to be so. There’s no need to precede it with “I think,” which can actually imply that you aren’t so sure that what you are writing is true or reasonable or sage or valuable.
Say you’re a client. Which would you rather hear your hundreds-of-dollars-an-hour communications partner advise?
The first example sounds a little namby-pamby, as if though you’re suggesting it you don’t want to take responsibility for it. The second example sounds confident, implying you know your stuff (which, presumably you do).
Keep in mind that the French mathematician, scientist, and philosopher René Descartes said, “I think, therefore I am.” He didn’t say, “I think, therefore I think I am” or “I think, I think, therefore I am.”
Note: Not to be outdone by an upstart like Descartes, it was Dilbert, of course, who said "I get mail, therefore I am" and Gertrude Stein who said "I am because my little dog knows me" and Liz Winston who said "I think, therefore I am single" and, finally, Saul Steinberg who said, "I think, therefore Descartes exists."