How to Meditate by the Middle
The Buddha's timeless advice on meditation by the Middle is like tuning the strings of a vīṇā: not too tight or loose. (AN 6.55) This means avoiding being uptight, nervous, stressed, or anxious, as well as being overly lax, lazy, careless, or unfocused. This principle applies to all, whether you're a beginner or an advanced meditator.