To learn one thing from another/ to put two and two together/ to deduce/ surmise

He understood one thing through another. He understood only the subject through the givens. He drew the conclusion that arose from the course of events.

("At the hour when a man is brought before the judge, they say to him: You have married and given in faith, you have set times for the Torah, you have dealt with fertility and increase, you have looked for salvation, you have peppered with wisdom, have you understood a word from a word?" - Shabat Lo A"a, and so: "A musician knows and a mighty man of war (1 Samuel 16:18) - who understands a word from a word, and a man who enlightens, who enlightens "Before the walk" - Midrash Rav Ruth 44, and so on: "And he shall give three times his measure,...and he shall consider the end of the matter from its beginning, and he shall proceed from one thing to another, and he shall compare one thing to another, and he shall judge according to the measures that the Torah requires" - Harambam/ Sefer Hamada, Hilchot Talmud Torah, Chapter 1, 113, and so on: "And if "The wise man, according to him, said to him, "You have no need of me, you yourself will understand a thing from within a thing." - H. Baer/ To the place where the spirit goes, 168)

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