Old age is a time of humiliations, the most disagreeable of which, for me, is that I cannot work long at sustained high pressure with no leaks in concentration.
It is the characteristic excellence of the strong man that he can bring momentous issues to the fore and make a decision about them. The weak are always forced to decide between alternatives they have not chosen themselves.
Choice of attention-to pay attention to this and ignore that-is to the inner life what choice of action is to the outer. In both cases, a man is responsible for his choice and must accept the consequences.