Be not unmindful of the graces of life. Let thy body be stalwart, yet not ungainly either in motion or in repose. Let not thy face alone, but thy whole body, make manifest the alertness of thy mind. Yet let all this be without affectation. (Book vii., § 60.)
Thy breath is part of the all-encircling air, and is one with it. Let thy mind be part, no less, of that Supreme Mind comprehending all things. For verily, to him who is willing to be inspired thereby, the Supreme Mind flows through all things and permeates all things as truly as the air exists for him who will but breathe. (Book viii., § 54.)
Men are created that they may live for each other. Teach them to be better or bear with them as they are. (Book viii., § 59.)
Write no more, Antoninus, about what a good man is or what he ought to do. Be a good man. (Book x., § 16.)
Look steadfastly at any created thing. See! it is changing, melting into corruption, and ready to be dissolved. In its essential nature, it was born but to die. (Book x., § 18.)
Co-workers are we all, toward one result. Some, consciously and of set purpose; others, unwittingly even as men who sleep,--of whom Heraclitus (I think it is he) says they also are co-workers in the events of the Universe. In diverse fashion also men work; and abundantly, too, work the fault-finders and the hinderers,--for even of such as these the Universe hath need. It rests then with thee to determine with what workers thou wilt place thyself; for He who governs all things will without failure place thee at thy proper task, and will welcome thee to some station among those who work and act together. (Book vi., §42.)