Another branch of blessedness, is a power of reposing ourselves and our concerns upon the Lord's faithfulness and care; and may be considered in two respects: a reliance upon him that he will surely provide for us, guide us, protect us, be our help in trouble, our shield in danger; so that however poor, weak, and defenceless in ourselves, we may rejoice in his all sufficiency as our own; -- and further, in consequence of this, a peaceful, humble submission to his will, under all events which, upon their first impression , are contrary to our own views and desires... For want of more of this spirit, multitudes of professing Christians perplex and wound themselves, and dishonour their high calling, by continual anxieties, alarms, and complaints. They think nothing safe under the Lord's keeping, unless their own eye is likewise upon it; and are seldom satisfied with any of his dispensations: for though he gratify their desires in nine instances, a refusal in the tenth spoils the relish of all, and they show the truths of the Gospel can afford them little comfort, if self is crossed. But blessed is the man who trusteth in the Lord, and whose hope the Lord is. He shall not be afraid of evil tidings: he shall be kept in perfect peace, though the earth be moved, and the mountains cast into the midst of the sea.
Taken from Letters of John Newton, Banner of Truth 1990, pg. 150-151