'Flesh' in the Bible

And Jesus answered and said unto him, Blessed art thou, Simon Bar-jonah: for flesh and blood hath not revealed it unto thee, but my Father who is in heaven.

and said, For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall become one flesh?

So that they are no more two, but one flesh. What therefore God hath joined together, let not man put asunder.

And except those days had been shortened, no flesh would have been saved: but for the elect's sake those days shall be shortened.

Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak.