Psalm 116:9 I will walk before the Lord in the land of the living.
When you invite God to be a part of your life you are making a very big change to your life; not just lifestyle but many things in your life change.
The psalmist expands this thought by saying their life is an open book to God; nothing can be or will be hidden from God.
They then give us all further hope by reminding us we are amongst Christians; we live amongst a living people, people who have life because we have a Saviour who gave it all for us!