“Think twice before you speak to a friend in need”
“Think twice before burdening a friend with a secret.”
“Think twice before you speak, because your words and influence will plant the seed of either success or failure in the mind of another.”
“Think twice before you speak, and then you may be able to say something more insulting than if you spoke right out at once.”
“It was one of those parties where you cough twice before you speak and then decide not to say it after all.”
“Think before you speak. Read before you think.”