Re: No
If we're only talking about pre-flop, then yes, you should really always call due to the odds you're getting. You can't really have any idea about what your opponent might have.
Once the flop comes, you can start to narrow down his possible hands. Many times you can reason out that he is far ahead of you and/or you don't have the odds to call his raise.
Pre-flop and post-flop are different.
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