For His name's sake. Those who openly profess to believing in Him are representing Him to others. We do our best to do this well.
Even though I walk through the valley of the shadow of death. Like the date of Christ's return, no-one knows when that might be. It is not human death but eternal death and separation from God that is to be dreaded.
I will fear no evil. Fear not because if You have asked Him to be with you, then He is and He has authority over evil spirits and the evil one, satan.
For You are with me. Even to the end of this age. The signs of this are well underway as recorded particularly in Revelations.