The mind must be developed by you alone. There is no way for others to do the work and for you to reap the results. Reading someone else's blueprint of mental progress will not transfer its realizations to you. You have to develop them yourself.
It is easy to remove the mind from harping on the lost illusion of immortality. The disciplined intellect fears nothing and craves no sugar-plum at the day's end, but is content to accept life and serve society as best it may. Personally I would not care for immortality in the least. There is nothing better than oblivion, since in oblivion there is no wish unfulfilled. We had it before we were born, yet did not complain. Shall we whine because we know it will return? It is Elysium enough for me, at any rate.
The music masters familiarize children's minds with rhythms and melodies, thus making them more civilized, more balanced, better adjusted in themselves, and more capable in whatever they say or do, for rhythm and harmony are essential to the whole of life.
But if nothing but soul, or in soul mind, is qualified to count, it is impossible for there to be time unless there is soul, but only that of which time is an attribute, i.e. if change can exist without soul.