In John 12:24 Jesus observed that unless a grain of wheat falls into the earth and dies to itself, it remains alone – but that if it dies, it bears much fruit.
Jesus used this observation to teach what came in the following verse. That is, he who seeks to hold on to his life loses it, while he who loses his life for Jesus’ sake will find it. As with all His teachings, Jesus was preaching something that He practiced.
God lost humanity due to sin. He was unwilling to remain by Himself alone, so He died to His glorious existence in order to become one of us – Jesus of Nazareth by name. Then in His human life He made the same choice and once again died to His privileged existence as a descendant of Abraham and David. These choices were entirely for our sake so that He could be raised from the dead and set on the path to recovery of all His previous glory, plus the glory He gains by this astounding adventure of love and courage.
Like the mustard seed, the grain of wheat became much more that what it was when it began.