The following poem is attributed to Nicholaus Ludwig Zinzendorf, the 18th century Moravian church leader and reformer. It captures well the ups and downs of life, the existential questions that emerge...
I have but one passion: It is He, it is He alone. The world is the field and the field is the world; and henceforth that country shall be my home where I can be most used in winning souls for Christ.