Musar על יבמות 127:8

This is the reason that G–d is perceived of as desiring the prayers of the righteous, since the service of G–d by means of prayer is a need that G–d feels, as we have mentioned on numerous occasions. The above is true only when the prayers are offered up in the Holy Land, a region from which the prayers ascend ever higher, something that cannot occur in the Diaspora in which the קליפות predominate and interfere. Prayers offered חוץ לארץ are as if dressed in the air of impurity, and it would be presumptuous to say that G–d longs for such prayers. Even in חוץ לארץ, however, the gates of tears subdue the forces of Lilith so that prayers offered in such circumstances are acceptable to G–d. The main difference between such prayers and identical prayers offered within the boundaries of ארץ ישראל is that the latter are something G–d has expressly desired. When the Torah speaks about וראית בשביה, the message is that while we are in exile, שביה, G–d does not desire that we worship Him in joy because we have not been found worthy to live in our homeland.