Once a lady in Cardiff, South Wales, asked him what he would recommend as the best tracts for witnessing. “Matthew, Mark, Luke, and John,” he responded, with no further elaboration. “Folks are always wanting promises to stand on,” he used to say. When one young man asked him, “Can you give me a promise to stand on?” Wigglesworth answered by placing his Bible on the ground and saying, “Stand on that.”
From the book "Smith Wigglesworth the secret of his power"