You ensure that there is a connection between cause and effect and hence when men perform a sacrifice they obtain good results . Otherwise how can there be future result for a past action? Thus on seeing your power in rewarding people performing sacrificial worship, with good results, men believe in Vedas and firmly engage themselves in various worshipful acts

क्रतौ सुप्ते जाग्रत्‌ त्वमसि फलयोगे क्रतुमतां
क्व कर्म प्रध्वस्तं फलति पुरुषाराधनमृते।
अतस्त्वां सम्प्रेक्ष्य क्रतुषु फलदान-प्रतिभुवं
श्रुतौ श्रद्धां बध्वा दृढपरिकरः कर्मसु जनः॥ २०॥

You ensure that there is a connection between cause and effect and hence when men perform a sacrifice they obtain good results . Otherwise how can there be future result for a past action? Thus on seeing your power in rewarding people performing sacrificial worship, with good results, men believe in Vedas and firmly engage themselves in various worshipful acts