In Jainism, aparigraha (non-possessiveness or non-attachment) is a fundamental ethical principle. While Jain scriptures do not prescribe scientific measurement methods, they do describe spiritual, ethical, and psychological effects that can be observed by a practitioner.

To measure the effect of practicing aparigraha for 10 days, one can reflect on the following Jain perspectives:

1. Self-Reflection (Swadhyaya)

Jain texts encourage daily self-examination. At the end of each day, reflect on:

• Did you feel less attachment to material possessions?
• Was there a reduction in desires or cravings?
• Did you experience contentment with what you have?
• Did you feel less disturbed by loss or gain?

2. Reduction in Kashayas (Passions)

Aparigraha helps in reducing kashayas such as anger, pride, deceit, and greed. Observe:

• Did you feel less anger or greed?
• Were you less likely to compare yourself to others?
• Did you experience fewer negative emotions tied to possessions?

3. Increased Compassion and Non-Violence (Ahimsa)

As per Jain teachings, non-possessiveness leads to greater compassion:

• Did you feel more empathy and willingness to share?
• Were you able to avoid harm that arises from possessiveness?

4. Simplicity and Peace of Mind

Jains believe aparigraha brings inner peace:

• Did you feel more at peace or mentally uncluttered?
• Was your daily life simpler and less stressful?

5. Behavioral Observations

• Did you give up unnecessary items?
• Did you avoid accumulating new possessions?
• Were you able to let go of attachments more easily?

Suggested Practice:

Maintain a daily journal for 10 days, noting your thoughts, feelings, and actions related to the above points. At the end of the period, review your entries to assess changes.

Note: In Jainism, the true measure of aparigraha is the degree to which it helps purify the soul, reduce karmic bondage, and promote spiritual progress, rather than material or worldly outcomes.

References:

• Tattvartha Sutra, Chapter 7
• Samayik (Jain meditation practice)
• Uttaradhyayana Sutra, Chapter 2

By introspecting in these ways, you can gauge the spiritual and psychological effects of practicing aparigraha according to Jain principles.