Why did Alexis Tsipras submit reform proposals that included measures rejected in the referendum?

Alexis Tsipras submitted reform proposals that included measures previously rejected in the July 2015 referendum primarily to prevent the total financial collapse of Greece and a potential "Grexit" (the country's exit from the euro zone).1

Following the referendum, in which voters overwhelmingly rejected the creditors' bailout terms, Greece faced a looming economic crisis with its banks closed and emergency funding restricted. Faced with these dire circumstances, Tsipras and the Greek government viewed the new, albeit draconian, bailout agreement as the "lesser of two evils". By presenting these reforms, Tsipras sought to secure a new €86 billion bailout loan to stabilize the economy, characterizing the resulting deal as a text he did not believe in but was "obliged to implement" to ensure the country's survival.12