I know what I can do. But, I also know what I cannot – which is equally important. That helps me set achievable goals and workable standards so that I keep myself motivated. Although, it may not always be a great idea to not strive for goals that are beyond your capacity. But, it is seldom that you try to achieve something that you know you can’t!
By keeping the inabilities “well bracketed”, I mean keeping them well in check. Brackets, here, are symbolic to categorized restriction (premise?). So, when you can keep a check on what you cannot do (or find impossible to achieve at a point in time), you can easily calculate what you can do.
At times, knowing what to reject works better than knowing what to accept. And, bracketing your inabilities is an important tactic in the strategy of rejection.