Where to keep it?

"...but keep my commands in your heart"  Proverb 3:1

As i was going through my 5 psalms and 1 proverb a day reading, I was struck by the simplicity of God's word.  Bibles have been kept in bookstores, bookshelves, now in handphones, computers, ipod, websites like blogs...etc.  But the only appropriate place to keep the Word of God is in our hearts.

Is God's word in my heart?

Where should It really be kept?