This is by Charles Spurgeon, and was recently quoted by a commenter at One Cosmos:
God be thanked for the simplicity of the gospel. The longer I live, the more I bless God that we have not received a classical gospel, nor a mathematical gospel, nor a metaphysical gospel; it is not a gospel confined to scholars and men of genius, but a poor man s gospel, a ploughman's gospel; for that is the kind of gospel which we can live upon and die upon. It is to us not the luxury of refinement, but the staple food of life. We want no fine words when the heart is heavy, neither do we need deep problems when we are lying upon the verge of eternity, weak in body and tempted in mind. At such times we magnify the blessed simplicity of the gospel. Jesus in the flesh made manifest becomes our soul's bread. Jesus bleeding on the cross, a substitute for sinners, is our soul's drink. This is the gospel for babes, and strong men want no more.
Image: C. H. Spurgeon, English Baptist preacher (1834-1892)