Judaism and Christianity. Majjhima Nikaya i.415, p. 465. If at any time there is doubt with regard to right conduct, follow the practice of great souls, who are guileless, of good judgment, and devoted to truth. Tradition is a fence for Torah. Tithes are a fence for riches.
Vows are a fence for saintliness.
A fence for wisdom is silence. I Ching, Great Commentary 1.3.4, p. 902. To spread white rushes underneath. This is the extreme of caution. Rushes in themselves are worthless, but they can have a very important effect.