इसी कारण।

उसने आपसे बात नहीं की, तभी आप रो रहे हैं।
इसी कारण, तभी

(used to introduce a logical conclusion) from that fact or reason or as a result.

Therefore X must be true.
The eggs were fresh and hence satisfactory.
We were young and thence optimistic.
It is late and thus we must go.
The witness is biased and so cannot be trusted.
hence, so, thence, therefore, thus