From days I wasn't able, there was always 'caine
Aside from the obvious meaning, this line is also a reference to the scriptural figures, Abel and Cain.
Malice is saying that on days where he can’t get money legally (Abel was nice), he could always get money illegally through drugs and crime (Cain was mean and killed Abel).
Also relates to the mention of “family” in the previous line; Cain and Abel were brothers.
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