more haste less speed

More haste less speed (BrEng)
used to say that it is better to do something slowly, because if you do it too quickly you will make mistakes (Тише едешь — дальше будешь; Поспешишь — людей насмешишь)

Example: "More haste, less speed - as always", murmured the snail as he watched.

see also
[hasty climbers have sudden falls]
Haste makes waste (AmE)