Epictetus on habit and practice

In the next place you do not even seek for one to give you advice, but you are vexed if you hear such things (as I say). Then you say, An ill-natured old fellow: when I was going away, he did not weep nor did he say, Into what danger you are going: if you come off safe, my child, I will burn lights. This is what a good natured man would do. It will be a great thing for you if you do return safe, and it will be worth while to burn lights for such a person: for you ought to be immortal and exempt from disease. Casting away then, as I say, this conceit of thinking that we know something useful, we must come to philosophy as we apply to geometry, and to music: but if we do not, we shall not even approach to proficiency though we read all the collections and commentaries of Chrysippus and those of Antipater and Archedemus.

The quote: EVERY habit and faculty is maintained and increased by the corresponding actions: the habit of walking by walking, the habit of running by running. If you would be a good reader, read; if a writer, write.

But when you shall not have read for thirty days in succession, but have done something else, you will know the consequence. In the same way, if you shall have lain down ten days, get up and attempt to make a long walk, and you will see how your legs are weakened. Generally then if you would make any thing a habit, do it; if you would not make it a habit, do not do it, but accustom yourself to do something else in place of it.