The back of a knit stitch is a purl and the back of a purl stitch is a knit. So if you knit in the same stitch, knit or purl, every row, you end up with the same thing--one row shows a knit row and one row shows a purl row.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog