To a physician, each man, each woman, is an amplification of one organ.

But the man and woman of seventy assume to know all, they have outlived their hope, they renounce aspiration, accept the actual for the necessary and talk down to the young. Let them then become organs of the Holy Ghost; let them be lovers; let them behold truth; and their eyes are uplifted, their wrinkles smoothed, they are perfumed again with hope and power.

The modernness of all good books seems to give men an existence as wide as man.

Prayer that craves a particular commodity—anything less than all good, is vicious. Prayer is the contemplation of the facts of life from the highest point of view. It is the soliloquy of a beholding and jubilant soul. It is the spirit of God pronouncing his works good. But prayer as a means to effect a private end is theft and meanness. It supposes dualism and not unity in nature and consciousness. As soon as the man is at one with God, he will not beg.

Beauty is the pilot of the young soul.

To laugh often and much ... this is to have succeeded. Probably not from Emerson: here's the full quotation and the story.

The true thrift is always to spend on the higher plane; to invest and invest, with keener avarice, that he may spend in spiritualcreation, and not in augmenting animal existence. Nor is the man enriched, in repeating the old experiments of animal sensation; nor unless through new powers and ascending pleasures he knows himself by the actual experience of higher good to be already on the way to the highest.