Unless
luwle' (loo-lay')
if not -- except, had not, if (...not), unless, were it not that.
thy law
towrah (to-raw')
a precept or statute, especially the Decalogue or Pentateuch -- law.
had been my delights
sha`shua` (shah-shoo'-ah)
enjoyment -- delight, pleasure.
I should then have perished
'abad (aw-bad')
to wander away, i.e. lose oneself; by implication to perish (causative, destroy)
in mine affliction
`oniy (on-ee')
depression, i.e. misery -- afflicted(-ion), trouble.