Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Reason
Reasons are like liquors, and there are some of such nature as none but strong heads can bear.
—Edmund Burke
Reason is to faith as the eye is to the telescope.
—John Caird
Reason, like virtue, in a medium lies:
A hair-breadth more might make us mad, not wise.
—Walter Harte
Human reason is like a drunken man on horseback; set it up on one side, and it tumbles over on the other.
—Martin Luther