The determination of Yesod is bolstered by the energy of Netzach to overcome any and all obstacles. Self-doubt is removed through the awareness that all can be accomplished even though the obstacles may now seem even more infinite as seen through the filter of doubt. There are many ways to overcome doubt—piling more doubt on top of the doubt  can sometimes have a paradoxical effect—reaching the depth of doubt—sure you cannot overcome—then you can.