Hashem used "both hands" to build the Bais Hamikdash; the right hand which created the heavens and the left hand which created the earth. In this way He was able to create an abode on earth for the heavenly Shechina. So too, a tzaddik's deeds are great because they combine the spiritual and physical. (Kli Yakar) For example: When we dwell in a succoh and bless on the four species.
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