Use 'therein lies...' when you want to emphasize the key problem within a complex situation.

Issue Highlighting

'Therein lies...' often carries an emotional charge, hinting at disappointment, irony, or revelation.

Emotional Weight

It can subtly highlight contrasts or comparisons between facts or situations.

Use 'therein lies...' to stress the physical or metaphorical place of something important.

It works well when revealing secrets or answers that were contained in a certain place or thing.

'Therein lies...' is often used metaphorically to draw attention to the core of a matter.