"I think" or "I feel"

Another follow-up to what I've written on "offenses": Offense Welcome: Please Debate This Article

“When 'I feel' began to overtake 'I think' in my classroom, I took a closer look at disagreeing well.”

“I’ve noticed that when you’re discussing things, you rarely preface your opinions with 'I think' or 'I believe.' Do you know what you say?”