Lovitt: SICHERHEIT - CERTAINTY

Sicherheit (certainty, security, trustworthiness, safeguard) very closely parallels Gewissheit (certainty, sureness, certitude, firmness), although in it the connotation of making secure is present in a way not found in Gewissheit. This nuance, resident heretofore in Heidegger’s discussion in the verb sichern (to make secure, to guarantee, to make safe), is now, with this use of Sicherheit — in conjunction with sich versichern (to assure oneself, to attain certainty, to insure one’s life, to arrest [someone]) and Versicherung (insurance, assurance, guarantee) — brought forward into the pivotal position it maintains in the discussion immediately following. (QCT   p. 88)