Concentrate every minute like a Roman—like a man—on doing what's in front of you with precise and genuine seriousness, tenderly, willingly, with justice. And on freeing yourself from all other distractions. (Hays translation)

Always aim at complete harmony of thought and word and deed. Always aim at purifying your thoughts and everything will be well.

Be true to the thought of the moment and avoid distraction. Other than continuing to exert yourself, enter into nothing else, but go to the extent of living single thought by single thought.

Let each man think himself an act of God,
His mind a thought, his life a breath of God;
And let each try, by great thoughts and good deeds,
To show the most of Heaven he hath in him.

Acquire the contemplative way of seeing how all things change into one another, and constantly attend to it, and exercise thyself about this part [of philosophy]. For nothing is so much adapted to produce magnanimity. ...But as to what any man shall say or think about him, or do against him, he never even thinks of it, being himself contented with these two things: with acting justly in what he now does, and being satisfied with what is now assigned to him; and he lays aside all distracting and busy pursuits, and desires nothing else than to accomplish the straight course through the law, and by accomplishing the straight course to follow God.

My thinking is first and last and always for the sake of my doing.

A human being in perfection ought always to preserve a calm and peaceful mind and never to allow passion or a transitory desire to disturb his tranquility.

Man must act in such a way that the whole of his individuality lies in each moment.

Think of Krishna always and try to work sincerely, and everything will come automatically.