Not only if we are slow in doing a good deed, then we have less merit, but then, meanwhile, the mind will be occupied with evil thinking as well. So if you think it’s a good thing, then do it right away. Occupy yourself with that before your mind will have nothing to do and then keep veering to the negative tendency. Because the mind when it has nothing to do, it just does nonsense. So it’s better to busy the mind with good things.