In plain words
Sai's resolve is a resolve of diamond
The students sang very well. The Anantapur campus, the Brindavan campus and the Prasanthi Nilayam campus all took part in the bhajan very well and showed Bhakti and śraddhā in every way. However valuable the things in the bank called Sai's grace, however valuable the things He has resolved to give you, leave it all to Sai's resolve. When He is ready to give you the most holy and precious diamond of grace, you need not ask for small and petty desires. If you leave it to Sai's grace, all graces merge in Him, and He will give you happiness and Śānti in every way.