Know what you know
Spurgeon offers an antidote to the epidemic of haziness in the allegedly-evangelical would-be mind:
Know what you know, and, knowing it cling to it. Hold fast the form of sound doctrine. Do not be as some are, of doubtful mind, who know nothing, and even dare to say that nothing can be known. To such the highest wisdom is to suspect the truth of everything they once knew, and to hang in doubt as to whether there are any fundamentals at all. I should like an answer from the Broad Church divines to one short and plain question. What truth is so certain and important as to justify a man in sacrificing his life to maintain it? Is there any doctrine for which a wise man should yield his body to be burned? According to all that I can understand of modern liberalism, religion is a mere matter of opinion, and no opinion is of sufficient importance to be worth contending for. The martyrs might have saved themselves a world of loss and pain if they had been of this school, and the Reformers might have spared the world all this din about Popery and Protestantism. I deplore the spread of this infidel spirit, it will eat as doth a canker. Where is the strength of a church when its faith is held in such low esteem? Where is conscience? Where is love of truth? Where soon will be common honesty? In these days with some men, in religious matters, black is white, and all things are whichever colour may happen to be in your own eye, the colour being nowhere but in your eye, theology being only a set of opinions, a bundle of views and persuasions. The Bible to these gentry is a nose of wax which everybody may shape just as he pleases. Beloved, beware of falling into this state of mind; for if you do so I boldly assert that you are not Christian at all, for the Spirit which dwells in believers hates falsehood, and clings firmly to the truth. Our great Lord and Master taught mankind certain great truths plainly and definitely, stamping them with his “Verily, verily;” and as to the marrow of them he did not hesitate to say, “He that believeth shall be saved, but he that believeth not shall be damned;” a sentence very abhorrent to modern charity, but infallible nevertheless. Jesus never gave countenance to the baseborn charity which teaches that it is no injury to a man’s nature to believe a lie. Beloved, be firm, be stedfast, be positive. There are certain things which are true; find them out, grapple them to you as with hooks of steel. Buy the truth at any price and sell it at no price.