Even as believers should learn to look for reasons behind their faith, skeptics must learn to look for a type of faith hidden within their reasoning. All doubts, however skeptical and cynical they may seem, are really a set of alternative beliefs (Tim Keller, The Reason for God, p. xvii).
Through marriage God fills the earth with (mostly unwitting) witnesses to the relationship between him and his covenant people. This is one of the main reasons that divorce and remarriage are so serious. They tell a lie about God's relationship to his people. God never divorced his wife and married another. There were separations and much pain, but he always took her back (John Piper, What Jesus Demands from the World, p. 303).
When we suffer what seems like endless pain, it is hard to believe that God loves us, but Jesus' suffering proves that it can be true ... The cross is the only evidence that can fully persuade you that God is, at all times, good and generous. There is no arguing with someone who is willing to make this ultimate sacrifice (Ed Welch, Depression: A Stubborn Darkness, p. 51).
He who did not spare his own Son, but delivered him over for us all, how will He not also with Him freely give us all things? (Romans 8:32)