If we sow the wind, we will surely reap a whirlwind
If you sow anger, you will reap violence. If you sow discord you will reap hate. Whatever you sow, you will reap the consequences of that which follows.
If you speak with "forked tongue" you will fall into a pit you cannot get out of. If you speak of love with only flattery of tongue, you will someday find yourself treated with disdain.