Tilak and neck beads are necessary for every devotees, because no spiritual function can be successfully performed without them.

Tilak and neck beads are necessary for every devotees, because no spiritual function can be successfully performed without them. 
Yajna dana tapo homa svadhyaya pitr tarpanam 
Vyartham bhavati tat sarva my urdhva pundra vina krtam
"Without applying the lamp flame tilak mark on the forehead, no religious or spiritual function can be performed by anyone. Be it performing a sacrifice, giving charity, performing austerity, studying the scriptures, worshipping the deity or offering oblations to the forefathers, because if they are performed without wearing the tilak mark on the forehead, they remain fruitless or award less result" 
Love, Happiness & Peace ~ Har Har Mahadev Shambhu ~ Har Har Bhole Namah Shivaya!