What does it mean for the government to "praise" those who do good (1 Pet. 2:13-14; Rom. 13:3)?

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My question pertains to two passages. The first one, 1 Peter 2:13-14 reads (NKJV),

Therefore submit yourselves to every ordinance of man for the Lord’s sake, whether to the king as supreme, or to governors, as to those who are sent by him for the punishment of evildoers and for the praise of those who do good (emphasis added).

The second, Romans 13:3, reads (NKJV),

For rulers are not a terror to good works, but to evil. Do you want to be unafraid of the authority? Do what is good, and you will have praise from the same (emphasis added).

What does it mean for the government to "praise" those who do good in these passages, contrasted with punishing those who do evil? What would be examples of such in first-century Rome or elsewhere? Thanks!