Note that Still Forrest Pool was compiled by jack kornfield & paul breiter.
So not sure that is a quote maybe more paraphrase.
Whatever there is that arises in the mind, just watch it. Let go of it. Don't even wish to be rid of thoughts. Then the mind will reach its natural state. No discriminating between good and bad, hot and cold, fast and slow. No me and no you, no self at all. Just what there is. When you walk on alms-round, no need to do anything special. Simply walk and see what there is. No need to cling to isolation or seclusion. Wherever you are, know yourself by being natural and watching. If doubts arise, watch them come
and go. It' s very simple. Hold on to nothing. It is as though you are walking down a road. Periodically you will run into obstacles. When you meet defilements, just see them and just overcome them by letting
go of them. don't think about the obstacles you have passed already . Don't worry about those you have not yet seen. Stick to the present. Don't be concerned about the length of the road or about the destination. Everything is changing. Whatever you pass, do not cling to it. Eventually the mind will reach its natural balance where practice is automatic. All things will come and go of themselves. (Teachings of Ajahn Chah p. 76)
Some context for the Munindo quote:
[Munindo] characterised a practice centered on trust in a non-judgmental awareness of the present moment as ‘source-oriented’ practice, contrasting it to ‘goal-oriented’ striving. (p.7)
The satipatthana refrain is of interest, Analayo p. 111:
At this comparatively advanced stage satipatthana is practised for its own sake. With this shift in attitude, the goal and the act of meditation being to merge into one, since awareness and understanding are cultivated for the sake of developing ever more awareness and understanding. The practice of satipatthan becomes "effortless effort", so to speak, divested of goal-orientation and expectation. It is preciesly this way of contemplating tha tin turn enables one to proceed independently, "without clinging to anything in the world" of expiernece, as stipulated in the final part of the refrain"