God's Unspeakable Love is toward mankind. There are no words to describe His love, like in John 3:16 - For God so loved the world the He gave his only begotten son, that whosoever believeth in him, shall not perish, but have everlasting life.
After God has expressed His love toward us, we shall then return our love back to Him through Christ. I Peter 1:8 says, "Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory."
