to do work in time, do not miss the time

to be powerless, all tricks or tactics to fail, all efforts to come to nought

to let slip an opportunity

a bad workman quarrels with his tools

only the wearer knows where the shoe pinches

one who has not suffered cannot understand the sorrows of others or sympathize with them

a fool is interested only in food

one who has not suffered cannot understand the sorrows of others or sympathize with them

none knows who?

let no one know, keep hidden

be unable to hear due to din

love does not care for caste and race

lovers do not care about caste or class

not letting a chance go

of no use, having no connection

allow no respite