Know! Even though it may seem to each person that the obstacles that one faces in service of G-d are greater than another’s and that it is impossible to overcome them, in truth, this is really not so. For there is no obstacle that a person cannot break if one really wants to. Moreover, G-d sends a person obstacles only in accordance with a person’s own strength and ability to withstand them if the person really wants to. Additionally, if a person looks closely, one will be able to understand that G-d is concealed even within the obstacle itself. Therefore, the truth is that there is no such thing as an obstacle at all, since all obstacles are but an illusion.
Rebbe Nachman, Likutei Moharan II: 46
By Yaakov Shmuel