Make haste

Cf. L. festina lente, make haste slowly; after [Suetonius Augustus xxv. 4.] nihil autem minus perfecto duci quam festinationem temeritatemque convenire arbitratur. crebro itaque illa iactabat: σρɛῦδɛ βραδέως, he [Augustus] thought that haste and rashness were alike unsuited to a well-trained leader. So he often came out with sayings like ‘make haste slowly’ [etc.]; [c 1385 Chaucer Troilus & Criseyde i. 956] He hasteth wel that wisly kan [knows how to] abyde.

Gently make haste. ‥A hundred times consider what you've said.
[1683 Dryden Poems (1958) I. 336]

Make haste slowly.
[1744 B. Franklin Poor Richard's Almanack (Apr.)]

‘Festina lente,’ Miss Dora suggested slyly. ‘Not bad advice,’ Max said cheerfully. At Annie's glare, he added quickly, ‘Make haste slowly.’
[1989 C. G. Hart Little Class on Murder xii.]

Related to: haste; patience and impatience

Bibliography of major proverb collections and works cited from modern editions is available here.

Also, make it snappy. Hurry up, move or act quickly, as in If you don't make haste we'll be late, or Make it snappy, kids. The first expression was first recorded in Miles Coverdale's 1535 translation of the Bible (Psalms 39:13): "Make haste, O Lord, to help me." The variant dates from the early 1900s and uses snappy in the sense of "resembling a sudden jerk." The oxymoron make haste slowly, dating from the mid-1700s, is a translation of the Latin festina lente. It is used either ironically, to slow someone down (as in You'll do better if you make haste slowly), or to comment sarcastically on a lack of progress (as in So far the committee has been making haste slowly).