As far as mental development is concerned, we should never be complacent. We can develop our minds infinitely - there is no limitation.
Dalai LamaThe practice of patience guards us against losing our presence of mind. It enables us to remain undisturbed, even when the situation is really difficult. It gives us a certain amount of inner peace, which allows us some self-control, so that we can choose to respond to situations in an appropriate and compassionate manner, rather than being driven by our disturbing emotions.
Dalai Lama