“What does it mean to ‘call upon’ the Lord?”
The expression “to call upon” the Lord sounds admittedly archaic today. We don’t talk about calling upon the doctor, the lawyer or the bankruptcy trustee.
With reference specifically to God, the words “call upon” are a translation of the Hebrew qārā' or qārā' šēm, which means to address by name, to single out or identify. The first time the phrase appears in scripture is in Genesis 4, where the statement is made, “At that time people began to call upon the name of the Lord.”
What time was that? So glad you asked.