Oh, to know the grand truths of the gospel, and to know them infallibly.
For instance, the grand doctrine of the substitutionary sacrifice of the Son of God—to know it and hold it and say,
"Let others question and quibble,
but I must believe it;
it is my only hope,
it is all my salvation.
I stake my soul upon it: if that be not true then am I lost."
And so with regard to all the other grand truths of revelation, the thing is to know them and grasp them firmly.
Charles Spurgeon "Hold Fast Your Shield," a sermon published in 1875.