الْأَنَاةُ مِنَ اللَّهِ، وَالْعَجَلَةُ مِنَ الشَّيْطَانِ
Translation: Deliberation is from Allah, whereas haste is from Satan.
Source: رواه الترمذي
ArabicMeaning
الْأَنَاةُcalm deliberation; acting with patience and thought
الْعَجَلَةُundue haste; rushing without due consideration
مِنَ اللَّهِfrom Allah
مِنَ الشَّيْطَانِfrom Satan
The contrast concerns how an action is undertaken: with composure and care, or through impulsiveness. Mere slowness is not automatically virtuous.