John Newton's Letters
Difficulties and snares
    April 15, 1776.
    My dear Sir, 
    I often rejoice on your behalf. Your call out of the world was a singular, 
    comfortable instance of the power of grace. And when I consider the 
    difficulties and snares of your situation, and that you have been kept 
    in the middle path, preserved from undue compliances on the one hand, and 
    unnecessary singularities on the other, I cannot doubt but the Lord has 
    hitherto helped and guided you. Indeed you have need of his guidance. At 
    your young years, and with your expectations in life, your health firm, and 
    your natural spirits lively—you are exposed to many snares. Yet if the Lord 
    keeps you sensible of your danger, and dependent upon him, you will walk 
    safely. Your security, success, and comfort, depend upon him; and in the way 
    of means of grace—chiefly upon your being preserved in a humble sense of 
    your own weakness. 
    It is written, "Fear not, I am with you." It is written 
    again, "Blessed is the man who fears always." There is a perfect harmony in 
    those seemingly different texts. May the wisdom which comes from above, 
    teach you and I to keep them both united in our view. If the Lord is with 
    us—we have no cause of fear. His eye is upon us, his arm is 
    over us, his ear is open to our prayer; his grace sufficient, his 
    promise unchangeable. Under his protection, though the path of duty should 
    lie through fire and water—we may cheerfully and confidently pursue it. 
    On the other hand, our hearts are so deceitful, fallible, 
    and frail; our spiritual enemies so subtle, watchful, and powerful; and they 
    derive so many advantages from the occasions of every day, in which we are 
    unavoidably and unexpectedly concerned; there is so much combustible 
    materials within us, and so many temptations arising from without, capable 
    of setting all in a flame; that we cannot be too jealous of ourselves and 
    our circumstances. 
    When we can say, in the Psalmist's spirit, "Hold me 
    up" we may warrantably draw his conclusion, "and I shall be safe!" 
    But the moment we lean to our own strength and wisdom—we are in imminent 
    danger of falling. The enemy who wars against our souls, is a consummate 
    master in his subtle devices, prolific in stratagems, and equally skillful 
    in carrying on his assaults by sap or by storm. He studies us, if I may so 
    say, all round, to discover our weak sides. He is a very proteus for 
    changing his appearances, and can appear as a sly serpent, a roaring lion, 
    or an angel of light—as best suits his purpose. It is a great mercy to be in 
    some measure acquainted with his devices, and aware of them. Those who wait 
    humbly upon the Lord, and consult carefully at his word and throne of grace, 
    are made wiser than their enemy—and enabled to escape and withstand his 
    wiles. 
    I know you will not expect me to apologize for putting 
    you in mind of these things, though you know them. I have a double warrant; 
    the love I bear you, and the Lord's command, Heb. 3:13. Use the like freedom 
    with me; I need it, and hope to be thankful for it, and accept it as one of 
    the best proofs of friendship.
    May the Lord bless and keep you. Pray for us, and believe 
    me to be sincerely yours.