Tlopa'a six words of advice. 

1. Don't recall/ Let go of what has passed/ mi mno
2. Don't imagine/ Let go of what may come/ mi bsam
3. Don't think/ Let go of what is happening now/ mi shes
4. Don't examine/ Don't try to figure anything out/ mi dpyod
5. Don't control/ Don't try to make anything happen/ mi sgom
6. Rest/ Relax, right now, and rest/ rang sar bzhag

Tilopa also gave Mahamudra instructions to Naropa

The fool in his ignorance, disdaining Mahamudra, knows nothing but struggle in the flood of samsara.
Have compassion for those who suffer constant anxiety!
Sick of unrlenting pain and desiring release, adhere to a master,
For when his blessing touches your heart, the mind is liberating.

"The problem is not enjoyment, the problem is attachment."

Drigung Kyabgon Chetsang Rinpoche writes:
“Sustain the fresh, non-arising mind without delusion.
In this uncontrived, natural state
Completely avoid the fabrication of meditation and meditator
The non-meditating, undisturbed, ordinary mind
Remains non-attached and non-separated
Free from hope and fear, grasping and letting-go
Rejection and acceptance, meditation and post-meditation.”

http://tibetanmeditationcenter.com/lineage/