Don’t make promises you can’t keep. Always be true!
Sometimes promises that are broken hurt the promisor more than the one who had been made that promise, unless it’s habitual. ~ Pat Gruber
You should never make any promises, as one has no control over the future.
When you hope for something and it doesn’t happen then you have to pick up the pieces and start all over again. It gets harder each time. ~ Myra Blevins