If you are steady either in success or failure, that is called yoga. Don’t mind for the success or failure. Do act on behalf of the Supreme Lord and if you are steady in that position, then your working in spiritual platform is successful.
There is a Vedic axiom that we can judge a tree by the fruit it bears. If this is a valid measure, then three strong contemporary indicators reveal that our way of life is a failure: widespread suicide, drug use and mental illness. All these factors point to a similar conclusion: maybe material success is not sufficient on its own.
Real success is to go back to Godhead.
Lecture on Real Success Stories Are in Srimad-Bhagavatam (SB 8.4.15; Ljubljana, Slovenia, 26 Dec 1998)
One must accept the words of an Acharya, a bona fide spiritual master, to clear the path for spiritual advancement. This is the secret of success. However, one’s guide must be a spiritual master who is actually an unalloyed devotee strictly following the instructions of the previous acharya without deviation. Whatever the spiritual master says must be accepted by the disciple. Only then is success certain. This is Vedic system.
Our span of life on earth is short. Our life will be crowned with success if the body wears out with constant discourses on Hari.
Success in spiritual life lies not in being the Best, but doing the Best.