Translation - Analects 2.10 Watch their actions.

子曰：「視其所以，觀其所由，察其所安。人焉廋哉？人焉廋哉？」

子曰：“视其所以，观其所由，察其所安。人焉廋哉？人焉廋哉？” 

Shì qí suǒyǐ, guān qí suǒ yóu, chá qí suǒ ān. Rén yān sōu zāi? Rén yān sōu zāi?

"Watch their actions; observe their reasons; examine them at rest. People, how can they hide [their nature]? People, how can they hide [their nature]?"

Noteworthy elements:

The most interesting part of this translation for me was the following structure: [seeing verb] [person pronoun] [所] [transitive verb].

This structure provides the basis for the passage. 視 and 觀 can indicate simple sensory function, but they can also indicate a more evaluative manner of observation. 察 can also be a kind of examination, but almost always involves an evaluative component. This may involve inquisitively examining the phonemena or considering consistency with prior phenomena.

所 results in turning the following transitive verb into a nominal phrase. For example, "take" or "use" becomes "that which is taken" or "that which is used." 以 has a number of translations, but I tend to defer to "take" or "by means of."

This is an interesting case where 所 and 以 should be understood separately and not as 所以. The second and third phrases also use 以 but here it is clear 以 is operating singularly.

*Side note, Chinese thought tends to regards sensory action in terms of complete/successful versus incomplete/unsuccessful; this is inherited  by modern linguistic conventions, e.g. 看到，看不到; the heart-mind is also regarded as a sense organ, and is responsible for evaluation.