Introduction
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Divisio (see above)  1) First part: human beings can’t know by certain and true knowledge whether they will be saved or damned, because that would mean knowing as much as God. 2) Second part: God sometimes reveals salvation to someone. Exemplum: Moses asks for forgiveness for the sin of idolatry: “Dimitte, Domine, populo tuo noxam hanc, aut dele me de libro vite” (Exodus 32, 31-32); “liber vitae” = the certain and true knowledge, i.e. God’s knowledge (reference to Thomas Aquinas), consequently Moses knew by revelation that he was written in the liber vitae. 3) Third part: parallel between illness and sin: just as death can be predicted from the signs of illness, damnation can be predicted from the signs of sin. On the contrary, salvation can be predicted from positive signs (for example going to church every day, hearing mass willingly and with devotion, going to confession several times a year, etc.).
Conclusion  Even if we are certain of our destiny, we must never stop doing well and even better; multiple reasons [but only one is developed]: the first, in case of certain damnation, is to obtain a lighter punishment (exemplum from Vita dei santi Padri: a damned soul reveals to Macarius (Saint) the different conditions of the damned depending on the severity of their sin [the same exemplum is used in the sermon T19/6 Friday after Invocavit]).