Trial of 40 Days or 40 Years
Nobody cannot live alone in this world, though there have been some exceptions like Robinson Crusoe.
But most of people think that if they don't obey the regime or the mainstream of society, they cannot live in the society at a reasonable living standard. If you deny commercialism and the rule of money, you will lose your job or will be fired from your job.
If you don't obey any rules other than those taught by Christ Jesus, corporate management, which is a servant of Satan, will dismiss you from the company. If you don't obey any moral codes other than those taught by Christ Jesus, communities where you live will expel you. In that case, you have to be another Robinson Crusoe but not in a solitary island far off in the ocean but in the middle of a city or a village. You must become homeless surrounded by enemies everywhere. So you might be afraid and you might obey Satan that controls this world through money economy.
So, if you want to be a follower of Christ Jesus, you have to first go into the wilderness to live there for 40 days without money, status, and friends or a family. If you can survive for 40 days, you will have self-confidence to live in a city or a village as a follower of Christ Jesus, fighting Satan.
Indeed, Christ Jesus Himself experienced this trial as the Bible depicts.
But, as a tribe, Hebrews had to live in the wilderness for 40 years after having exited Egypt, being led by Moses.
Maybe you can judge a nation, such as Japan, the US, the UK, China, and Russia, based on what they had achieved in 40 years after WWII, though it is 70 years today after the War.
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Mar 8:7 And they had a few small fishes: and he blessed, and commanded to set them also before them.
Mar 8:8 So they did eat, and were filled: and they took up of the broken meat that was left seven baskets.
Mar 8:9 And they that had eaten were about four thousand: and he sent them away.