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CC Madhya 22.54

‘sādhu-saṅga’, ‘sādhu-saṅga’ — sarva-śāstre kaya
lava-mātra sādhu-saṅge sarva-siddhi haya
sādhu-saṅga sādhu-saṅga — association with pure devotees; sarva-śāstre — all the revealed scriptures; kaya — say; lava-mātra — even for a moment; sādhu-saṅge — by association with a devotee; sarva-siddhi — all success; haya — there is.
“The verdict of all revealed scriptures is that by even a moment’s association with a pure devotee, one can attain all success.

According to astronomical calculations, a lava is one eleventh of a second.