sure
slow but sure: seeslow.
sure as eggs is eggs (also sure as fate) without any doubt; absolutely certain.
sure thing
1 a certainty.
2 certainly; of course. informal
❶ 2001Business Week Any potential legal challenge to Microsoft's bundling decisions in XP is no sure thing.
❷ 2000 John BallemManchineel 'Hand me your gun.' 'Sure thing, boss.'