If you are distressed by anything external, the pain is not due to the thing itself but to your own estimate of it; and this you have the power to revoke at any moment.
A double-minded man is unstable in all his ways.... A determinate purpose in life, and a steady adhesion to it through all disadvantages, are indispensable conditions of success.
All life is the struggle, the effort to be itself. The difficulties which I meet with in order to realize my existence are precisely what awaken and mobilize my activities, my capacities.
It is not the weight of the future or the past that is pressing upon you, but ever that of the present alone. Even this burden, too, can be lessened if you confine it strictly to its own limits.