When we believe that God is Father, we also believe that such a father's hand will never cause his child a needless tear. We may not understand life any better, but we will not resent life any longer.
Love always involves responsibility, and love always involves sacrifice. And we do not really love Christ unless we are prepared to face His task and to take up His Cross.
If a man fights his way through his doubts to the conviction that Jesus Christ is Lord, he has attained to a certainty that the man who unthinkingly accepts things can never reach.
For the Christian, heaven is where Jesus is. We do not need to speculate on what heaven will be like. It is enough to know that we will be for ever with Him.
But the best definition of it is to say that heaven is that state where we will always be with Jesus, and where nothing will separate us from Him any more.