I don't know. I can't learn anything.

My Professor told us the following event in his life

He enrolled in Indian Statistical Institute which has the reputation of giving degree to single digit number of students every year as the course work is so tough and gruelling that most of the students drop out from the course. My professor also dropped the course due to stress. Burnt out, he returned to his home. His dad said nothing on his arrival. Few weeks passed, his dad asked him - "What do you plan to do next?"

He replied - "I don't know. I can't learn anything."
His dad replied - "If that had been true, you would still be in your mother's lap drinking milk from the bottle." got up and left.

In a few days my professor joined the class again and was one of the students to receive PhD from Indian Statistical Institute.