Jamieson, Fausset and Brown on Jude 1:24-25

24-25. Concluding doxology.

Now--Greek, "But."

you--Alford, on inferior authority, reads, "them." You is in contradistinction to those ungodly men mentioned above.

keep ... from falling--rather, "guard ... (so as to be) without falling," or stumbling.

faultless--Greek, "blameless."

before the presence of his glory--that is, before Himself, when He shall be revealed in glory.

with exceeding joy--literally, "with exultation" as of those who leap for joy.