Hawzah News Agency – Imam al-Sadiq peace be upon him says:

كانَ أبي يَقولُ: إذا هَمَمْتَ بخَيرٍ فبادِرْ، فإنَّكَ لا تَدْري ما يَحْدُثُ.

'My father used to say, 'When you intend to do a good thing, then hasten to undertake it for you do not know what will happen.'

Source: al-Kafi, v. 2, p. 142, no. 3