Such a conclusion nullifies the Bible as the Word of God. Recently a Christian friend, Steve Taylor, posted a message on a mailing list that I moderate explaining a common form of speech we all use regularly, is used in the Bible, but is not often considered in the context of Bible interpretation. The form of speech is synecdoche . I have reproduced his message below, minus some introductory remarks that were pertinent to the one to whom he was responding. Synecdoche is a very common grammatical tool used by all of us.
Synecdoche means the part represents the whole, or sometimes, the whole represents the part.
The heart represents the whole person on which we aim to confer a blessing. It is synecdoche. The part represents the whole. God bless the whole person. It's good to see all of you.