A student I taught in 1990-91 reconnected with me on FB. While we were catching up on each other’s lives, she suddenly mentioned a motivation quote that I brought up in class one day. To be honest, I have no recollection of that particular lesson.
As teachers, you may have a similar experience. Teaching is something you do day in and day out. You may not realise that in a certain lesson on a certain day you said or did something which soon eluded your memory, but ONE student had remembered. And it might even have a profound impact on his/her later life.
Never underestimate the influence of what you do, or say, to your students.