What does the three-foot podium mean a lifetime of feelings?

The phrase "a three-foot podium, a lifetime of feelings" means that as a teacher, he has devoted his life to education and his love and concern for students. The three-foot podium is where teachers work. They stand there to explain knowledge, guide students, and impart their knowledge and experience to students. Life-long feelings refer to teachers’ love, investment and dedication to education, as well as their care and concern for students. This sentence expresses the teacher's deep emotion and responsibility for education and students.