When you get into the classroom, there is nothing on the blackboard. It is black and blank. It's just a dark slate and nothing more.
And then, little by little, the blackboard opens to life: it fills up. It fills up with signs, letters, digits, sentences, sums, and sometimes drawings; and beyond all these signs, there are thoughts.
And now the blackboard does exist by itself, beyond the slate.
Blackboard is like school. At the beginning you go to school and you know nothing; then, bit by bit, you learn; in the end, you know' well, at least a little'
Blackboard is like life. At the beginning, there is nothing; then you move forward, you proceed, and life fills up; and in the end, all fades away and vanishes; like on the blackboard.
' This the fifth gospel'