In The Light of Gita

क्लैब्यं मा स्म गमः पार्थ नैतत्त्वय्युपपद्यते।
क्षुद्रं हृदयदौर्बल्यं त्यक्त्वोत्तिष्ठ परन्तप॥

O Arjuna! You are divine and omnipotent Atman. You are capable of doing everything. This cowardice doesn't befit you. Give up this weakness of heart, stand up and fight the difficulties of your life with courage. There is nothing impossible for you in the world.

How Spiritual Giants Are Produced

Take up one idea. Make that one idea your life - think of it, dream ofit, live on that idea. Let the brain, muscles, nerves, every part ofyour body, be full of that idea, and just leave every other idea alone. This is the way to success, that is way great spiritual giants are produced.

We are responsible for what we are,and whatever we wish ourselves to be, we have the power to makeourselves. If what we are now has been the result of our own pastactions, it certainly follows that whatever we wish to be in futurecanNever think there is anything impossible for the soul. It is thegreatest heresy to think so. If there is sin, this is the only sin ? tosay that you are weak, or others are weak. Be produced by ourpres.The goal of mankind is knowledge ... Now this knowledge isinherent in man. No knowledge comes from outside: it is all inside.What we say a man 'knows', should, in strict psychological language, bewhat he 'discovers' or 'unveils'; what man 'learns' is really what hediscovers by taking the cover off his own soul, which is a mine of infinite knowledge and actions; so we have to know how to act.

- Swami Vivekananda