The existence of the celestials as stated in the Vedas, the efficacy of (religious) acts and the capacity for action of beings furnished with bodies are noticeable in every Yuga.
वेदोक्तमायुर्देवानामाशिषश्चैव कर्मणाम्। फलत्यनुयुगं लोके प्रभावश्च शरीरिणाम्॥