"Recognizing his designing hand does not make you stoic or dishonest or artificially buoyant. Instead, the reality of God’s design elicits and channels your honest outcry to your one true Savior. God’s design invites honest speech, rather than silencing us into resignation. Consider the honesty of the Psalms, of King Hezekiah (Isaiah 38), of Habakkuk 3. These people are bluntly, believingly honest because they know that God is God and set their hopes in him. Psalm 28 teaches you passionate, direct prayer to God. He must hear you. He will hear you. He will continue to work in you and your situation. This outcry comes from your sense of need for help (28:1-2). Then name your particular troubles to God (28:3-5). You are free to personalize with your own particulars. Often in life’s ‘various trials’ (James 1:2), what you face does not exactly map on to the particulars that David or Jesus faced – but the dynamic of faith is the same. Having cast your cares on him who cares for you, then voice your joy (28:6-7): the God-given peace that is beyond understanding. Finally, because faith always works out into love, your personal need and joy will branch out into loving concern for others (28:8-9). Illness can sharpen your awareness of how thoroughly God has already and always been at work in every detail of your life. "

-- David Powlison

(http://www.desiringgod.org/resource-library/taste-see-articles/dont-waste-your-cancer)