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This expression means that you don’t have to make a decision right about a future problem. You should decide what to do about that problem when the problem is directly in front of you.
It think is that he was jealous so unferth tries to undermine him unjustly.
“Like dissolves like" is an expression used by chemists to remember how some solvents work. It refers to "polar" and "nonpolar" solvents and solutes.