"Go back?" he thought. "No good at all! Go sideways? Impossible! Go forward? Only thing to do! On we go!" So up he got, and trotted along with his li… - J. R. R. Tolkien

It is not our part to master all the tides of the world, but to do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who live after may have clean earth to till. What weather they shall have is not ours to rule.

"Good Morning!" said Bilbo, and he meant it. The sun was shining, and the grass was very green. But Gandalf looked at him from under long bushy eyebrows that stuck out further than the brim of his shady hat.

"What do you mean?" he said. "Do you wish me a good morning, or mean that it is a good morning whether I want it or not; or that you feel good this morning; or that it is a morning to be good on?"

"All of them at once," said Bilbo. "And a very fine morning for a pipe of tobacco out of doors, into the bargain.

...

"Good morning!" he said at last. "We don't want any adventures here, thank you! You might try over The Hill or across The Water." By this he meant that the conversation was at an end.
"What a lot of things you do use Good morning for!" said Gandalf. "Now you mean that you want to get rid of me, and that it won't be good till I move off.

I do so dearly believe that no half-heartedness and no worldly fear must turn us aside from following the light unflinchingly.