Crystal-clear and As Clear as Mud

In the middle of the discussion, my Filipino teacher says crystal, then I say clear. Also, my chemistry teacher asks, is it as clear as mud?, I answer no. Going back to my Senior High School and freshman year in college, as one of the students who sit and actively listen while the teacher talks, I only see those phrases as attention-getter.  I became more awake and attentive during class as I responded crystal, clear, no, and yes. "Crystal-clear and as clear as mud" are idioms that are opposite from each other. Crystal- clear means to easily understand, while as clear as mud is something hard to understand. But I came to realized that behind these idiomatic expressions is a teachers' care for their students. Teachers always ask the students if they understood the lesson. The role of the teacher is not only to teach but to make sure that students are learning. They always care for us because they want the best for us. And now, crystal- clear and as clear as mud is no longer just an attention-getter, but for me, it is the teacher's expression of love, concern, and care for their students. Now, I appreciate that my teachers love me, and to my fellow students, our teachers love us.