The remaining distance to your chosen campsite remains constant as twilight approaches. The net weight of your boots is proportional to the cube of the number of hours you have been on the trail. When you arrive at your chosen campsite, it is full. If you take your boots off, you'll never get them back on. The local density of mosquitoes is inversely proportional to your remaining repellent.
Man has less tenacity than crab grass.
The bee fertilizes the flower it robs. When it is dark enough, you can see the stars. There are no absolute answers to life - just revelations. Everybody in the room was there. The lake comes right up to the shore.