Charanadasa Charitam. Vol III Book VII Chp 20 Shlokas 8 - 10
अतिक्रान्तेषु वर्षेषु विपिने योगसाधनैः |
नान्यत्फलमवापैष व्यर्थं देहक्लमं विना ||
नितरां दुःखितो धीमाननवाप्तमनोरथः |
महांक्ष्चरणसदासोsयं न लेभे शान्तिमीप्सिताम् ||
तदा कृष्णाज्ञया तत्र शुकदेवो महामुनिः |
आविर्भूय कृपासिन्धुः कृष्णतत्वमुपादिशम् ||
After many years of such yogic life he did not gain any worthy reward but for the physical strain he underwent. As his desire was unfulfilled, Charanadasa became very sad and lost his piece of mind. At that time at the command of Shri Krishna the compassionate seer Shri Shuka appeared there and preached him the Krishna tattoo.