If you please the lord that is "Success" even though you are not materially successful. However if you do not please the lord – that is "failure" even though you are materially successful.
Love of Godhead means that you surrender to God. You have to do what God says! God says that give up all religions. There are many so called religions. There is also dharma of body. We have got dharma towards our country, family and children but you will find that you will never be satisfied. What makes you satisfied? “samsiddhih-hari-tosanam”. If you can please Hari, Krishna, that is success.
Success of our activites is when we have absorption in God.