We have to be able to discriminate between what we need and what we want. To have this power or strength, there must be sadhana. Every day a devotee must execute sadhana: hearing and chanting the holy name of the Lord. Before he begins his chanting, he should pray to Lord Balarama, “I am in ignorance. I cannot get rid of this big heavy load that I am carrying by my own strength. I am completely dependent upon You to dispel my ignorance. Please give me the strength! I don’t have it on my own. Please, give me the strength to chant my rounds attentively. Give me the strength to overcome these anarthas.” That is sadhana. If we do that every day, we will feel that we get some strength.
LFD Vol 3,Spiritual Strength Pg 134, 6th paragraph