One possible version:
Dear class,
Today I’d like to share with you the proverb “Time and tide wait for no man.” I read it in an English magazine for middle school students. I like it very much for two reasons. First it is very easy to remember because all the words used are very simple. Second, this proverb always encourages me to make good use of my time to study. Next time, if you happen to meet someone who is easting too much time playing computer games, you can say to him,” Time and tide wait for no man. Go to study now!” Of course, you can also say it to yourself when you are feeling lazy and don’t want to do anything.
Thank you