As are thy wonted thoughts, so is thy mind; and the soul is tinged by the coloring of the mind. Let then thy mind be constantly suffused with such thoughts as these: Where it is possible for a man to live, there he can live nobly. But suppose he must live in a palace? Be it so; even there he can live nobly. (Book v., §16.)
Live with the gods! And he so lives who at all times makes it manifest that he is content with his predestined lot, fulfilling the entire will of the indwelling spirit given to man by the Divine Ruler, and which is in truth nothing else than the Understanding--the Reason of man. (Book v., §27.)
Seek the solitude of thy spirit. This is the law of the indwelling Reason--to be self-content and to abide in peace when what is right and just hath been done. (Book vii., § 28.)
Let thine eyes follow the stars in their courses as though their movements were thine own. Meditate on the eternal transformation of Matter. Such thoughts purge the mind of earthly passion and desire. (Book vii., § 45.)
Search thou thy heart! Therein is the fountain of good! Do thou but dig, and abundantly the stream shall gush forth. (Book vii., § 59.)