The Ramban's Letter, Part Four

In all your actions, words, and thoughts, always regard yourself as standing before Hashem, with His Shechinah above you, for His glory fills the whole world. Speak with fear and awe, as a slave standing before his master. Act with restraint in front of everyone. When someone calls you, don't answer loudly, but gently and softly, as one who stands before his master.

~ from The Ramban's Letter to His Son

Do not be quick with your mouth,

do not be hasty in your heart

to utter anything before God.

God is in heaven

and you are on earth,

so let your words be few.

~ Ecclesiastes 5:2