Avoid speaking words which will sting and hurt

He should avoid speaking words which will sting and hurt and not strike anyone on vital spot. But should engage himself in pure, virtuous deeds, keeping his mind, all the time, firmly on the duty.
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Center of power of Conscience

Fear the God alone and never leave the righteousness  

Keep the center of power of Conscience of virtue and vice, constantly awake

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Fear the God alone

Fear the God alone and never leave the righteousness
   Keep the center constantly awake, center of, power of Conscience of virtue and vice

From Sai TatvaRatnaVali