What if, I know this is difficult. you don't replace them with variables?
In your OP, you used the phrase 'logical truth'. In logic, the phrase 'logical truth' has a technical meaning. It refers to logical expressions that are true simply because of their form. In other words, no matter what subject a person is talking about, if their expression takes the form of a logical truth, it will be true.
Generally speaking, logic is concerned with the form of expressions, arguments and proofs, rather than with their content. So logicians will often replace the referring expressions in natural language sentences (the names of individuals, classes and properties) with variables. Hence, 'symbolic logic'.
Typically, a logical expression with a particular logical form will be true on some interpretations of its variables, and false on others. If it's true on all interpretations of its variables, it's a 'logical truth'. This area of logic in which variables are interpreted is called 'formal semantics'. (It's of interest in linguistics and has practical applications in computer science.)
https://en.wikipedia.org/wiki/Formal_semantics_(logic)
Why did you add the word "now", what was it that compelled you to put it in a temporal context?
Your proposition #1 in the OP states "If something is logically true, it has always been true". And your proposition #3 states "It has always been true that human beings would be logical".
You introduced the temporal considerations yourself. I was just responding to that. I noted that conventional logic pays no attention to time and that when temporal operators are introduced, analogous to past, present and future tense in natural language, new complications appear. This is the province of temporal and tense logics.