The rules of punctuation are rhetorical (and thus stylistic), not grammatical. The terms - period, comma, colon - derive from classical rhetoric, where they referred to the rhythms of spoken, not written language. You write a period to indicate a full stop in speech. You write a comma to indicate a pause, with more to follow. Etc.
So if you write your example with no commas, you're signaling to the reader that your sentence is to be spoken straight through, with no significant pauses. If you insert a comma, you're telling the reader "pause here, but don't do a full stop, there's more to come".
So the two alternative examples you give are just encodings of two ways to speak the text. They're both perfectly acceptable - and so is the version without commas - which means it's effectively a stylistic choice.
However, note that rhetorical devices affect meaning in very subtle ways. Your first example, with two commas, makes "was picked" stand out, just because it is isolated by a pause on both sides. You might want to use that form if you want to emphasize that you were selected (maybe because of your virtues), rather than merely accepted.