There is something good in all seeming failures. You are not to see that now. Time will reveal it. Be patient.
There is no end of craving. Hence contentment alone is the best way to happiness. Therefore, acquire contentment.
The harder the struggle, the more glorious the triumph. Self-realization demands very great struggle.
Do not brood over your past mistakes and failures as this will only fill your mind with grief, regret and depression. Do not repeat them in the future.