Periculosæ plenum opus aleæ Tractas, et incedis per ignes Suppositos cineri doloso.
You are dealing with a work full of dangerous hazard, and you are venturing upon fires overlaid with treacherous ashes. Horace, Odes, Book II. 1. 6. The following line (authorship unknown) is sometimes added: "Si morbum fugiens incidis in medicos." [In fleeing disease you fall into the hands of the doctors.]