Young blood must have its course, lad, and every dog its day.

Do what thou dost as if the earth were heaven, and thy last day the day of judgment.

There are two freedoms - the false, where a man is free to do what he likes; the true, where he is free to do what he ought.

No earnest thinker is a plagiarist pure and simple. He will never borrow from others that which he has not already, more or less, thought out for himself.

For men must work and women must weep, And the sooner it's over, the sooner to sleep.

I can conceive few human states more enviable than that of the man to whom, panting in the foul laboratory, or watching for his life under the tropic forest, Isis shall for a moment lift her sacred veil, and show him, once and for ever, the thing he dreamed not of; some law, or even mere hint of a law, explaining one fact; but explaining with it a thousand more, connecting them all with each other and with the mighty whole, till order and meaning shoots through some old Chaos of scattered observations.

It is only the great hearted who can be true friends. The mean and cowardly, Can never know what true friendship means.