How much room, how much space, is there in a tight fist?
Sometimes the harder we try to grasp, to make sense of, the tighter our mind becomes. It squeezes. And because of that we get very tired. We can squeeze out the mud through our fingers. In time there is no space left and we are drained by all that effort. We may give ourselves a migraine through all that grasping.
As the Diamond Sutra suggests stop trying so very hard to get your head around something, take a chill pill and relax. Stop grasping. Turn tight-fist mind into empty-palm mind.
Only go straight, do not use tight-fist mind.