Ground not upon dreams you know they are ever contrary.

The line cautions against basing decisions or beliefs on dreams, which are portrayed as inherently unreliable and “contrary” to waking truth. In early modern thought, dreams could be read as divine warnings, demonic temptations, or mere bodily “vapours,” but they were widely treated as unstable evidence. The speaker’s imperative—“Ground not upon dreams”—frames dreams as a poor foundation for action, urging reliance on firmer proofs: observation, reason, or verified report. The phrasing also implies that dreams often invert or distort reality, so taking them literally may lead one into error or self-deception.