“a more abundant life”

…He was very sad to hear of your sadness and difficulties. Should that be only due to the passing of your son, it is not full justified, at least in the light of the teachings of Bahá'u'lláh. He explicitly states that, had we the vision to see the other world, and the mind to conceive its glory, we would not desire to remain here even for a moment. Man is destined by God to undergo a spiritual development that extends throughout eternity. His life upon this earth is only the first stage of that development. When we outgrow our physical form, and are considered by God ready to reap the fruit of our spiritual development, we proceed to the other world. We term it death only because of our short sightedness. A more proper term would be 'a more abundant life.' it is a forward step we have taken. In the light of the teachings, therefore, the proper attitude for you is to pray that God may encompass your son with His infinite blessings, that he may enhance his development and give him that felicity which awaits...every soul.

...the world is full of suffering. Bahá'u'lláh tells us that the deeper are the furrows it digs into our very being, the greater will be the fruit of our life and the more enhanced our spiritual development. All the Saints that shine in the history of society had to pass through tribulations. Their form was various but their effect has always been the same, namely, the purification of our heart and soul for receiving the light of God. 

- Shoghi Effendi  (From a letter written on behalf of Shoghi Effendi to an individual believer, December 9, 1931; compilation: ‘Lights of Guidance’)