John Gill Commentary 1 Timothy 5:25

"In like manner also there are good works that are evident; and such as are otherwise cannot be hid." — 1 Timothy 5:25 (ASV)

Likewise also the good works [of some] are manifest
before hand
The characters of some men, on the other hand, are so fair and bright; and it is so clear a point, that they have received the grace of God in truth; and have a rich furniture for the ministry; and are sound in the doctrine of faith; and are men of such godly lives and conversations, that they prevent any formal inquiry, examination, and judgment; and there can be no difficulty in admitting them at once:

and therefore the above rule is not designed for such persons, but to guard against those with whom things do not appear so very clear and manifest:

and they that are otherwise cannot be hid ;
if they are men of bad principles or practices, they will be discovered in time; for there is nothing hid that shall not be revealed; time will make all things manifest; their errors and sins will break out, and will be exposed:

and therefore it is right to wait a while, and not to be quick in the reception of them into the Gospel ministry; for otherwise, much mischief may be done to the souls of men, and much dishonour brought on the ways and doctrines of Christ.