Nature is no obstacle

One needs only to believe completely that there is absolutely no practical difference between then [before the previous Rebbe's passing] and now, and to fulfill the shlichus. One can see with his own eyes that those who stayed firm in this--they didn't stop to consider how this could be possible according to the laws of nature, since they knew that they are going in the shlichus of the Nosi of the generation, that he is the one who has control [is balabos over] nature--they had great success.

One needs to make a complete resolution that when one is connected with the Rebbe, nature has no opinion at all, and one needs to decide that the Rebbe is able to give and wants to give, and this is not only regarding success in fulfilling his shlichus, but also in what comes down [hashpa'a] in the physical realm for personal things, as was stated earlier that the Rebbe is concerned also for the material needs of every single one.

Sicha of the Lubavitcher Rebbe, 14 Shevat 5713