4:40  

अज्ञश्चाश्रद्दधानश्च संशयात्मा विनश्यति ।
नायं लोकोऽस्ति न परो न सुखं संशयात्मनः ॥४-४०॥

adnyashchaashraddadhaanashcha saMshayaatmaa winashyati ।

naayaM loko'sti na paro na sukhaM saMshayaatmanaH ॥४-४०॥

Source: Automatic ITRANS Transliteration

The ignorant and the faithless and the self-doubter is ruined.
Neither in this world nor in the next is there happiness for the self-doubter.

The ignorant, faithless, self-doubter is ruined. Neither in this world nor in the next is there happiness for the self-doubter.

Source: Milind S. Pandit

But the ignorant, who has no faith and is full of doubt (about the Self), perishes. There is neither this world nor the world beyond nor happiness for the one who doubts.

Source: The Bhagavad-Gita: The Sacred Song

But ignorant and faithless persons who doubt the revealed scriptures do not attain God consciousness. For the doubting soul there is happiness neither in this world nor in the next.

Source: Bhagavad Gita As It Is