It's written, 'seek and ye shall find'. But first, 'imagine what you seek'.
Otherwise, you will end up searching everything everywhere forever.

It is written, 'seek, and ye shall find'. But first, 'imagine what you seek'. Otherwise, you will end up searching everything everywhere forever.

If you want to find wilier race by common sense,
then you have just narrowed your searching area.

Smartass Disciple: How the hell do we find the truth ?
Master of Stupidity: Just seek it with hope it’ll find you.

If alien races have interbred with human kind since long time ago, then there is no need to look for them outside us.

The naive lose it in dark woods, but seek it under the street lamps.