I would tend to agree with all that dear Glad (peace to you!), posted, dear Iam (peace to you, as well!), with some slight differences:
Life has chosen to live in us therefore we were worthy of life before we were born.
Life has chosen to "live" in SOME of us. In others, however, death "lives." Which is why we see death come OUT of such ones, see it manifest THROUGH them. Thus, serial killers, war mongers, murderers... even [certain] religious leaders and others who sole vocation is to suck the life OUT of others...
The only qualification required is that we are alive and we are wonderfully alive.
While it is true that we are all alive... in that we are animated... that life is not always the same. If the only qualification is that we are alive... and wonderfully alive... then, again, many are very "dead." I would counter, then, that for life to truly be IN us... the qualification is faith... that he IS.
Again, peace to you, both!
A slave of Christ, the Life...
SA