Before one engageth in an act, one should consider the competence of the agent, the nature of the act itself, and its purpose, for all acts are dependent on these. Considering these one should begin an act, and not take it up on a sudden impulse. He that is wise should either do an act or desist from it fully considering his own ability, the nature of the act, and the consequence also of success.

In plain words: Before starting anything, think about whether you are able to do it, what the task really involves, and what it is for. Then decide calmly to go ahead or stop, instead of acting on a sudden impulse.