There are men I could spend eternity with. but not this life. — Kathleen Norris. American writer (1880–1966)
Before you begin a thing, remind yourself that difficulties and delays quite impossible to foresee are ahead. If you could see them clearly, naturally you could do a great deal to get rid of them but you can't. You can only see one thing clearly and that is your goal. Form a mental vision of that and cling to it through thick and thin.
When you are unhappy, is there anything more maddening than to be told that you should be contented with your lot?
Life is easier than you'd think; all that is necessary is to accept the impossible, do without the indispensable, and bear the intolerable.