When the Lord says that at the time of death whoever thinks of Him as Brahman or Paramātmā or as the Personality of Godhead certainly enters into the spiritual sky, there is no doubt about it. There is no question of disbelieving it.
The Bhagavad-gītā (BG 8.6) also explains the general principle that makes it possible to enter the spiritual kingdom simply by thinking of the Supreme at the time of death:
- yaṁ yaṁ vāpi smaran bhāvaṁ
- tyajaty ante kalevaram
- taṁ tam evaiti kaunteya
- sadā tad-bhāva-bhāvitaḥ
"Whatever state of being one remembers when he quits his present body, in his next life he will attain to that state without fail."