There are no guarantees in this world... check that... the only guarantee is that God will never leave us or forsake us... even when - not if, when - it appears that He has, He hasn't.
A few quotes...
[The Furious Longing of God, Brennan Manning]
"Is your own personal prayer life characterized by the simplicity, childlike candor, boundless trust, and easy familiarity of a little one crawling up in Daddy's lap? An assured knowing that the daddy doesn't care if the child falls asleep, starts playing with toys, or even starts chatting with little friends, because daddy knows the child has essentially chosen to be with him for that moment? Is that the spirit of your interior prayer life?" (44)
[a simple prayer] "Abba, I belong to You." [a powerful transformation] "The greatest gift I've ever received in my life in Jesus is the Abba experience. I can only stutter and stammer about the life-changing power of the Abba encounter." (46-47)