Knowledge
Knowledge means to know that I am helpless in this world and only the power of God can save me.
Preaching
Preaching means to see whatever little spark of bhakti in someone and fan it into a blazing fire, which will burn all the anarthas (contaminations) and make him a great devotee.
Success
If we do the right thing with right intent, that is our success.
Becoming Humble
Even if you have done no wrong, no mistake in the last 50 years, remember the mistake you did 51 years ago and repent for it and become humble.