In Jain Shwetambar diksha, the final decision is always taken by the Guru Bhagwant / Acharya after observing the person’s vairagya, discipline, fitness, and ability to follow the vows.

Generally, a person is not considered fit for diksha if they have:

• No true vairagya or only temporary emotional attraction
• No capacity to follow strict Jain vows of ahimsa, aparigraha, brahmacharya, and discipline
• Serious mental instability or inability to understand and observe the life properly
• Very young age / lack of maturity
• Severe physical incapacity that makes observance of the daily ascetic conduct impossible
• Strong attachment to family, wealth, status, or comforts
• An unwillingness to give up worldly life completely
• A tendency to break vows or live carelessly

In simple words, diksha is not for anyone who is still deeply attached to worldly life or cannot strictly live the Jain monk/monkess discipline.

Also, in Shwetambar tradition, the exact eligibility can differ slightly by Gachchha, Guru tradition, and current circumstances, but the core principle remains the same: only one with genuine renunciation and the ability to follow the vows is fit for diksha.