Aitreya Brahmana on action

Lying down in an idle stupor is Kali Yuga, Being vibrantly conscious is Dwapara, Standing up with a firm intention is Treta, Moving while intention, intuition & action are aligned is Satya Yuga

कलिः शयानो भवति संजिहानस्तु द्वापरः
उत्तिष्ठस्त्रेता भवति कृतं संपाद्यते चरंश्चरैवेति
Aitariya Brahmana - Adhyaya 3, Khanda 3

 Only through action does one find honey or sweet fruits. Be constantly active like the sun & never get fatigued.

चरन् वै मधु विन्दति चरन् स्वादुमुदुम्बरम् ।
सूर्यस्य पश्य श्रेमाणं यो न तन्द्रयते चरंश्चरैवेति ॥