My wife and I have taught in schools. She has almost only ever taught Kindergarten (about 4 months of not in eight years), and I taught 7th Grade Mathematics and further back in Special Education.
I tell you what, working with a lot of kids can teach a lot about life! Especially how cruel and mean people can be.
A recent movement in the past few years is called “Be Kind”. The name is pretty self explanatory, and they do some good work helping teach students to simply be nice to each other.
Proverbs chapter 12 can be summarized this same way: Be Kind.
Think about it: it starts with advice for controlling yourself (discipline, vv. 1-4), transitions through recognizing it starts with our thoughts (vv. 5-8), moves to our actions toward others (including animals! vv. 9-12), and the majority focuses on what we say (vv. 13-26).
Words probably get the most time because of how much we tear each other down with our words. Sometimes it is unintentional.
But we must remember that kindness starts internally, with our thoughts and beliefs. So, to be kind means we start by changing our thinking, and ultimately it happens by trusting in God.
He first showed His kindness by coming to us lowly sinners to reveal truth and die for our forgiveness. The ultimate kindness is leading others to life in Christ.
The path of the righteous is life, and in its pathway there is no death.